what is an ecosystem

1. What is intraspecific competition? a. A relationship between predator and prey b. Competition between individuals of the same species for limited resources c. Interaction between two different species in an ecosystem d. A form of predation where herbivores consume plants 2. How does interspecific competition affect ecosystems? a. It leads to an increase in biodiversity b. It causes one species to always become extinct c. It can change population sizes and species distribution d. It has no effect on ecosystems 3. Which of the following is an example of true predation? a. A cow grazing on grass b. A lion hunting a zebra c. A bee pollinating flowers d. A bird building a nest 4. What role do parasitoids play in ecosystems? a. They are primary producers b. They help control pest populations c. They are a type of prey d. They compete with herbivores for plants 5. Which of the following best describes a predator? a. An organism that is hunted and consumed b. An organism that feeds on plants c. An organism that hunts and consumes another organism d. An organism that lays eggs inside a host 6. How does grazing affect plant communities? a. It allows a single plant species to dominate b. It helps maintain diverse ecosystems c. It eliminates all plant life d. It has no impact on plant communities 7. What is the main difference between intraspecific and interspecific competition? a. Intraspecific involves different species; interspecific involves the same species b. Intraspecific involves the same species; interspecific involves different species c. Intraspecific competition is always beneficial; interspecific is not d. Intraspecific competition occurs only in aquatic environments 8. What is a common consequence of predation in ecosystems? a. Increase in prey population b. Overpopulation of predators c. Regulation of prey populations d. Extinction of all predators 9. Which interaction involves herbivores consuming plants? a. True predation b. Intraspecific competition c. Grazing d. Parasitism 10. How can interspecific competition influence natural selection? a. It does not influence natural selection b. It leads to cooperation among all species c. It can drive adaptation and evolutionary change d. It eliminates the need for adaptation

Create a review game for 9th grade biology students using the following topics Levels of Organization in an ecosystem- population, community, ecosystem, biome, biosphere Abiotic and Biotic Factors Differences between Food chains and food webs Trophic Levels Producers vs Consumers, Autotrophs vs. Heterotrophs Effects of Greenhouse gases and their effects on global systems. Biome examples Photosynthesis vs cellular respiration Types of Consumers Ecological Pyramids 10% rule Cycles of Matter/ Nutrient Cycles- Water Cycle, Carbon Cycle, Nitrogen Cycle, Phosphorus Cycle (note on the diagrams… the bigger the arrow, the larger amount of matter that moves through the cycle from that point to the next. Macromolecules- Carbohydrates, Lipids, Proteins, Nucleic Acids Nitrogen fixation Denitrification Eutrophication The usable form on nitrogen for plants is nitrate Population density and distribution-random, dispersed and clumped Birth rate and death rate Survivorship curves- Type I, II, and III Density dependent factors Density independent factors Exponential growth- J curve = unlimited resources, no limiting factors Logistical Growth-S curve= limiting factors, carrying capacity Symbiotic Relationships- Competition, predation, Herbivory, mutualism, parasitism, commensalism What is an invasive species? Why might countries limit certain species to coming into a new country or area? What is mycorrhizal? Succession- Primary vs Secondary Pioneer Species Climax community Biodiversity Climate change

2.2 Study Guide [ 2.2 Sequence Assessment 1/21 and 1/22] Ecosystems and Ecological Relationships Invasive Species ● An invasive species is a plant, animal, or organism that is not native to a specific area and causes harm to the environment or human health. Why are they harmful? Invasive species often outcompete native species for food, water, and space. They can spread quickly because they lack natural predators in the new environment. What is their impact on the ecosystem? Invasive species can reduce biodiversity by pushing native species to extinction or by changing the habitat in which native species live. Biodiversity and Its Importance to Ecosystems Biodiversity refers to the variety of life in a specific area, including different species of plants, animals, and microorganisms, and the ecosystems they form. ● Stability: Biodiversity makes ecosystems more resilient to changes such as climate change, diseases, and natural disasters. ● Food chains and webs: A greater variety of species means more sources of food for different animals, helping maintain a balanced food web. For example, a forest with many species of plants and animals can recover from a drought more easily than a forest with fewer species. Predator-Prey Relationships In a predator-prey relationship, one organism (the predator) hunts and eats another organism (the prey). The predator benefits by getting food, while the prey loses its life.The population sizes of predators and prey are often linked. If there are more prey, the predator population may grow, but if too many predators eat the prey, the predator population will decrease. This relationship can be shown in the graph below. ● For example: Lions hunt zebras for food. When there are many zebras, lions have more food and their population can grow. However, if too many lions eat the zebras, the zebra population can decrease. Predator-prey relationships help keep animal populations balanced, preventing one species from becoming too numerous and harming the environment. Ecological Relationships There are several types of relationships between organisms in an ecosystem. These include commensalism, parasitism, and mutualism. Commensalism In commensalism, one organism benefits from the relationship while the other is neither helped nor harmed. An example would be Barnacles and Whales. Barnacles attach to the skin of whales. The barnacles get access to nutrient-rich water while the whale swims, but the whale is not affected by their presence. Parasitism In parasitism, one organism (the parasite) benefits at the expense of the other organism (the host), which is harmed. For example, fleas live on dogs and feed on their blood. The fleas benefit, but the dog may suffer from itching, infections, or even anemia. Another example are tapeworms and humans. Tapeworms live in the intestines of humans and absorb nutrients, leaving the human host malnourished. Mutualism In mutualism, both organisms benefit from the relationship. An example would be bees and flowers: Bees collect nectar from flowers to make honey, while helping the flowers by transferring pollen, which helps them reproduce.

5th Grade Science Quiz: Movement of Matter in Ecosystems 1. Which organisms are responsible for breaking down dead plants and animals into simple nutrients? a) Producers b) Consumers c) Decomposers d) Predators 2. What is the process by which plants use sunlight to make food? a) Respiration b) Decomposition c) Photosynthesis d) Erosion 3. How do animals contribute to the movement of matter in an ecosystem? a) They produce oxygen b) They break down dead organisms c) They release nutrients through waste d) They absorb carbon dioxide 4. What is the primary source of energy for most ecosystems? a) Soil b) Water c) Sunlight d) Air 5. How does matter move through the environment? a) It flows in a straight line b) It cycles through various organisms and the environment c) It remains stationary d) It only moves between plants and animals Answer Key (Always review AI generated answers for accuracy - Math is more likely to be inaccurate.) 1. c) Decomposers 2. c) Photosynthesis 3. c) They release nutrients through waste 4. c) Sunlight 5. b) It cycles through various organisms and the environment

LESSON 3 Characteristics of Living Things Learning Objectives • Describe each characteristic of life • Relate each characteristic of life with how first forms of life evolved What sets living things apart from nonliving things? Organisms are equipped with different characteristics that allow them to grow, adapt, survive, and perpetuate. These include the ability to metabolize, respond to stimuli, interact, and reproduce, among others What are the characteristics of life? Try to look at your surroundings and identify the living things that you see. You have probably identified a lot. Many scientists believe that there are more than 10 million kinds of living things that exist on Earth today. But the question is, how can something be considered living? There are certain characteristics that all living things exhibit: the characteristics of life. Living things are made up of cells. They metabolize, grow and develop, respond to stimulus, adapt to their environment, and reproduce. Living Things Are Made up of Cells All living things are made up of cells. Cells are the basic building blocks of all living things. Each cell contains materials that carry out basic life processes such as respiration. In the 1600s, an argument against the theory of spontaneous generation was made. Italian physician and biologist Francesco Redi disproved the theory that all living things come from nonliving things. Cells have different properties and characteristics. The cell theory describes the properties of all cells. There are three tenets of the cell theory: 1. The cell is the basic unit of life. 2. All living things are composed of one or more cells. 3. All cells arise from preexisting cells. The discovery of the cell is largely attributed to Robert Hooke. Upon examining a piece of cork using a microscope that he built, Hooke observed tiny compartments that he called "cells" (from the Latin word cella, meaning "little room"). Matthias Schleiden suggested that all structural parts of plants are made up of cells. In 1839, Theodore Schwann stated that along with plants, all animals were composed of cells. From these conclusions about plants and animals, advancement on the study of animal parts and functions began. In 1855, Rudolf Virchow included the idea that all cells came from preexisting cells. Some living things are made up of only single cells. Single-celled or unicellular organisms include bacteria, some protists, and some fungi. Even though composed of single cells, these organisms carry out all the functions necessary for life. Most living things such as animals and plants, are multicellular organisms. They are composed of many cells, which are grouped together and perform specific tasks in the body. In different organisms, cells also vary in sizes, shapes, parts, and functions. There are two kinds of organisms according to their cell structure, the prokaryotes and eukaryotes (figure 5-3). Prokaryotes are single-celled organisms that lack a membrane-bound nucleus, mitochondria, and all other organelles. Its name comes from the Greek words pro, which means "before," and karyon, which means "nut or kernel." Eukaryotes are organisms with cells that contain membrane-bound nucleus and other membrane-bound organelles. The nucleus of a eukaryotic cell contains the genetic material (DNA), enclosed by a nuclear envelope. Other membrane-bound organelles are mitochondria, Golgi apparatus, and chloroplast found in photosynthetic organisms such as algae and plants. There are also unicellular eukaryotes known as protozoa. All other eukaryotes are multicellular organisms, such as plants, animals, and fungi. Living Things Metabolize Essential chemical reactions in life can be best described as building up (anabolism) and breaking down (catabolism) processes. In anabolism, the substances needed by organisms to grow, store energy, and repair tissues are synthesized. In contrast in catabolism, some complex substances are broken down, releasing the energy stored in their molecules. This happens in food digestion. This chemical building up and breaking down processes are collectively called metabolism. Metabolism, from the Greek word metabole meaning "change," is the sum total of all the life-sustaining chemical reactions in living things. It allows living things to grow, maintain their structures and functions, and respond to stimuli. Living Things Grow and Develop Growth and development are not new concepts to many. In all living things, growth involves the increase in one's size or height. However, growth is not just an increase in physical structure. It also involves complex changes in an organism. Growth and development occur rapidly from younger stages of life to maturity. In humans, animals, and plants, distinct changes brought by growth and development can be dearly identified. Microorganisms such as bacteria also undergo growth and development until they reach their maximum size and maturity. A life span is the average length of time a aving thing can live. Living things have different life spans. Humans have average life spectancy of 60 to 70 years, while some plants, such as the narra trees, can live for more than 100. Living Things Respond to Stimuli All living things respond to stimuli the environment. This responsiveness Increases survivability. Stimulus (plural: uli) is any signal or change in he environment of an organism that produces a response or reaction from that organism. Responses to stimuli depend on an organism's need. Responding to stimuli also maintains homeostasis in living things. Homeostasis is the internal balance of a body system. This balance is needed for the proper function and regulation of the living thing's body. For example, when a person is in a warmer environment, the body sweats, keeping the body maintain a temperature suited for the normal function of the body. Living Things Interact No living thing can live alone. Interaction among organisms is simultaneously happening on Earth. From the smallest microorganisms to the biggest organism, and from the North Pole to the South Pole of Earth, all are connected in one living system. An ecosystem is formed when a community of organisms interacts with another community and with their environment. Many processes and interactions, such as in a feeding relationship, life cycle, and the exchange of gases between plants and animals, occur in the ecosystem. These are some of the important processes needed to maintain life on Earth. Living Things Reproduce The ability of living things to produce offspring of their kind is called reproduction. Reproduction is not an individual organism's need, rather, it is for the species' perpetuation. In some cases, animals become extinct because of their inability to reproduce their kind. Higher forms of plants and animals reproduce through sexual reproduction. Sexual reproduction involves the union of sex cells or gametes-the egg cell from a female organism and the sperm cell from a male organism. This union gives rise to a new individual with characteristics or traits from both parents. Other simple organisms, such as bacteria and plants, can reproduce asexually. These organisms give rise to a new individual from their body. A bacterial cell divided in two through asexual reproduction gives rise to new bacteria, as shown in figure 5-5. A yeast can form buds that later on become separate individual. Plants grow new plants using their stem, leaf, and roots. Both sexual and asexual reproductions have important functions. In both cases, the genetic material (DNA) is passed on from one generation to the next, ensuring the survival of the species on Earth. 1. Bacteria copy their DNA by starting at any point on the circular chromosomes. 2. The two copies of DNA attach to the inside wall of the bacterial cell. 3. The cell starts to divide, forming a new membrane and cell wall. 4. The bacterial cell splits into two separate cells, each with their own DNA. Living Things Adapt and Evolve All living things can adapt to their environment. This adaptation is necessary for rvival. Adaptation depends on the need of an individual. A polar bear, for example, would not be able to survive in an extremely cold environment without its capacity adapt. Adaptation is any response or reaction toward a stimulus that helps in the survival of an organism. A seed-eating bird will eventually eat a worm when there are seeds to be found. This change in food choice is therefore its adapting mechanism. Prolonged adaptation to certain environments may lead to the gradual evolution of the succeeding generations. Evolution is the gradual change in organisms over a long period in response to changing environment. Living Things Are Organized Life on Earth exhibits organization. The atom is the smallest unit of matter, lowed by molecules, which are combinations of atoms. When these molecules are grouped together, they form a cell. The cell is the basic unit of life. In multicellular organisms, such as plants and animals, cells are grouped as tissues to perform specific Functions. Different tissues can be grouped further and form organs. Organs in animals include the heart, brain, and lungs, among others. The organs form organ systems that makes the function of the body more complex and efficient. Organ systems form the whole organism. All living things exhibit organization, whether they are unicellular or multicellular organisms..

News Opinion Sport Culture Lifestyle Show more Books Music TV & radio Art & design Film Games Classical Stage ‘Hollywood doesn’t do very much of that business, they have the nice sign, and everything’s good, but they don’t do very much,’ said Trump. View image in fullscreen ‘Hollywood doesn’t do very much of that business, they have the nice sign, and everything’s good, but they don’t do very much,’ said Trump. Photograph: Lucy Nicholson/Reuters Film ‘I’m not trying to hurt the industry’: Trump softens tone on movie tariffs California governor Gavin Newsom announces a $7.5bn tax incentive scheme as Trump’s announcement of 100% tariffs on films ‘produced in foreign lands’ is mocked by Jimmy Kimmel and Fallon Andrew Pulver Tue 6 May 2025 11.24 BST Share Donald Trump appears to be softening his tone after widespread dismay in Hollywood and further afield at his bombshell announcement of 100% tariffs on films “produced in foreign lands”, saying he was “not looking to hurt the industry”. In remarks reported by CNBC, Trump said he was planning to discuss the plan with film industry leaders. “I’m not looking to hurt the industry, I want to help the industry.” He added: “So we’re going to meet with the industry. I want to make sure they’re happy with it because we’re all about jobs.” Trump also took aim again at California state governor Gavin Newsom, saying the film industry “has been decimated by other countries taking them out, and also by incompetence, like in Los Angeles, the governor [Gavin Newsom] is a grossly incompetent man, he’s just allowed it to be taken away from”. Trump added: “Hollywood doesn’t do very much of that business, they have the nice sign, and everything’s good, but they don’t do very much.” Trump’s talk of film tariffs makes no sense, but it’s already doing damage – to Hollywood Peter Bradshaw Peter Bradshaw Read more Newsom responded with a statement saying: “Governor Newsom continues to champion California’s iconic film and television industry – recognising it as a cornerstone of the state’s economy, one that sustains hundreds of thousands of good-paying jobs across every sector around the state.” “His plan to more than double the state’s film and television tax credit reflects a commitment to keeping production here at home, supporting workers and maintaining California’s global leadership in entertainment. If the President announces a proposal with more details, we will review it.” Newsom had earlier responded to Trump’s announcement by proposing a $7.5bn federal tax incentive scheme, saying in a statement to Variety: “Building on our successful state program, we’re eager to partner with the Trump administration to further strengthen domestic production.” Tax incentive schemes in the US currently operate on a state-by-state basis, and Newsom had announced a plan in April to boost California’s to $750m. California senator Adam Schiff also condemned Trump’s tariff proposal while backing calls for a federal tax credit scheme, saying in a statement: “Blanket tariffs on all films would have unintended and potentially damaging impacts, [but] we have an opportunity to work together to pass a major federal film tax credit to re-shore American jobs in the industry.” Late night TV hosts Jimmy Kimmel and Jimmy Fallon also joined the chorus of dismay and bafflement at Trump’s plan. Commenting that Trump was “now aiming his wrecking ball at Hollywood”, Kimmel questioned whether foreign-made movies were a “national security threat” as Trump claimed. “I don’t care where they’re made. I really don’t. I guess it’s what the late, great Hannibal Lecter would’ve wanted. Sonic, the illegal immigrant hedgehog, is a national security threat and he must be stopped!” Kimmel also mocked actor Jon Voight’s role in Trump’s thinking, saying: “This is where he reportedly got the tariff movies idea – from Angelina Jolie’s 86-year-old father she won’t talk to. What a great idea. Next year, The White Lotus is gonna be set at a Hampton Inn.” Fallon also took aim at Trump’s implication that foreign locations were somehow taboo, saying: “Gonna be fun seeing the next Lord of the Rings filmed in Bayonne, New Jersey,” adding: “If you don’t like that, you can also watch Emily in Des Moines [instead of Emily in Paris]. It’s just as charming.” Explore more on these topics Film Film industry Donald Trump Trump tariffs Gavin Newsom Jimmy Kimmel Jimmy Fallon news Share Reuse this content Most viewed Live German parliament votes again on Merz’s bid to be chancellor after humiliating first round – Europe live Trump and Carney to meet at White House in closely watched encounter Mushroom lunch’s sole surviving guest details deadly meal and its aftermath as trial of Erin Patterson continues ‘It’s the misogyny slop ecosystem!’ How Candace Owens and the American right declared war on Blake Lively Wisconsin woman missing for more than 60 years found ‘alive and well’

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