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Arthropods And Echinoderms
Quiz by Stacy Dortch
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Vertebrates, Arthropods, and EchinodermsQuiz on phylum Annelida, Arthropod, Mollusca and EchinodermataCharacteristics and features of arthropodsLESSON 1 Origin of Life on Earth Learning Objectives • Describe how Earth was formed. • Describe the events that happened during Earth's formation. When and where did life possibly start? Many cultures develop different versions about the origin of life. However, modern scientists are still exploring the works of some well-known experts in the history of science in search of the true origin of life. Earth is said to be a little over 4.5 billion years (Gigaannum or Ga) old. The oldest material found on Earth that is estimated to be 4.3 billion years old is a zircon crystal. No one witnessed how Earth was formed and what exactly happened during that moment, but there are evidence that show how it all started. Earth's earliest times were geologically violent. There were continuous bombardment from meteorites. As Earth cooled and the surface solidified, the first solid rocks formed. Continents were not yet present; only a huge ocean with scattered small islands. Events such as erosion, sedimentation, and volcanic activities that were assisted by possible meteor impacts, gradually created the oceanic plates, which later evolved into continents. About 3.8 Ga, life on Earth initially began with single-celled organisms called prokaryotes. Over a billion year later, multicellular life evolved. Some studies show that life-forms began to evolve around 570 million years ago (Ma). This evolution started with early arthropods, followed by the fish (530 Ma), and land plants and forests (475 Ma and 385 Ma, respectively). It was only at around 200 Ma that early mammals emerged. Homo sapiens is believed to have evolved about 200000 years ago. Many things were revealed using fossil evidence, yet many questions remain unanswered about the origin of life. Science is continuously searching for answers on what was in the beginning.ARTHROPOD: Classification and Characteristics reviewerHey, Dr. Binocs! Hey there. Hello, Dr. Binocs. Hello. Oh, hello! Friends, did you spot any kinda difference between these two? I'll give you 10 points if you do! No? Well, don't worry. I'll tell you how they are different from each other. But for that I need to tell you all about the Animal Kingdom! Come with me! Zoom in! The Animal Kingdom is divided into two groups. Invertebrates and Vertebrates. And today, we will talk about the invertebrates. Animals without a backbone are called Invertebrates. Which are further classified into.. Worms! Sea Jellies! Mollusks! Anthropods! And Sponges! Now, let us explore a little into their worlds! Worms! They have long, soft bodies with no legs. Oh, and two body openings. You've seen earthworms, right? If you haven't, rush to your nearest garden! Sea Jellies! Jellyfish is a good example here. They have soft and long stinging bodies. Stinging because they use their stingers to stun their prey.. ..before pulling them into their stomach. Mollusks! They have soft and warm bodies. Many of them have hard shells, like the snail. Other examples are Octopus and Squid. Anthropods! These animals form the largest group of the Invertebrates. They have their skeleton on the outside of their bodies. Creepy crawlies such as cockroaches, spiders are anthropods. Sponges! They generally live in saltwater and don't move from place to place. They filter nutrients and tiny organisms out of water, for food. TRIVIA TIME! The Invertebrates will eat almost anything that was or is alive. 97% of all animal species are invertebrates. Well, that keeps a very tiny space for the vertebrates. So do one thing, check this video out, to know more about them! So this is me zoooming out! Tune in next time, for more fun facts.ArthropodsBio II - Arthropods