Which mechanism is used to maintain a stable internal environment in humans?

Industrial processes often release lead and copper compounds into waterways, which could then have adverse effects on human health. Previously, methods to remove these compounds were expensive and often produced toxins themselves. Researchers have now found that minced banana peels are able to quickly absorb lead and copper from river water. In addition, banana peels are non-toxic and inexpensive. The use of the banana peels in this case is probably a

Which abiotic factor would most directly limit the size of a gray squirrel population?

Human chromosomes differ from the chromosomes of fruit flies in that human chromosomes

One major benefit of the use of water power is that it

Adding chlorine to drinking water in many modern cities has been credited with reducing outbreaks of diseases, such as cholera. Some scientists claim that adding chlorine may result in by-products in the water that may very slightly increase the risk of cancer. The decision to add chlorine to drinking water most likely involved

Scientists initially studying the decline of certain penguin populations in Antarctic regions found that the penguins’ food source, a small animal known as krill, had dropped by 80%. These scientists are now studying the reduction in the number of tiny photosynthetic organisms that are the food source of the krill. The decline of the penguin population was a direct effect of the disruption of a

Which situation would most likely lead to increased diversity in a species?

Some allergies are inherited. Allergic reactions are often much less severe in adults who were exposed to the allergen (the substance causing the reaction) during infancy. What does this show about some inherited traits?

A tall building is built on an empty lot. The newbuilding blocks the sunlight on nearby streets for most of the day. Trees and plants grow more slowly or die off because the building has interfered with a

The Madagascar rose periwinkle, a species of rainforest flower that was used to treat cancer, is now endangered in its native habitat due to deforestation. Continuing the destruction of rainforests is likely to have a negative impact on future medical discoveries because it could cause a decrease in the

One reason why some organisms, such as insects, evolve much faster than others is because they

Fossil fuels are considered nonrenewable because

The male emperor penguin cares for his unhatched egg for a long period of time by resting it upon his feet and against his body. This behavior in the male penguins most likely developed over time because the behavior

Many advertisements warn pregnant women of the dangers of exposure to certain risk factors because these factors may

When a colony of bacteria was exposed toa particular antibiotic, some of the bacteria survived while others did not. Which concept is supported by this example?

When uncooked meat is tenderized using pineapple juice, specific organic molecules in the meat are broken down. This reaction occurs because the pineapple juice most likely contains

One factor that might threaten global stability and alter the equilibrium in an ecosystem is increasing

Which group of organisms would be at the greatest risk of extinction if they were infected by a deadly virus?

When a person gets a tattoo and the needle used is contaminated with a pathogen, how does the human immune system respond?

Which row in the chart below correctly pairs the life function with the cell structure and organ that carry out the function?

Extinction has been a part of the history of Earth for over 3 billion years. Most of the species that have lived on Earth no longer exist. One reason the extinction of species is so common is that

The diagram below shows the relationships between some present-day species of bear.

Which statement best explains why so many bear species arose from a single ancestor?

Which graph indicates that increasing the amount of antibiotic most effectively reduces the population of bacteria?

Bacteria are often used to study how genetic codes function in organisms. One reason these studies are useful is that

A process known as acidification (lowering the pH) has been increasing in the oceans since the Industrial Revolution began. Acidification is related to the amount of carbon dioxide that dissolves in the oceans. One possible cause of the increase in carbon dioxide levels over the years is

In preparing the results of an experiment for publication, the use of a peer review committee would help the researcher to

Scientists have inserted genes into potato plants, which enable the potatoes to produce a specific vaccine. The technology used to develop the potatoes that produce this vaccine involves

A company makes a claim about the effectiveness of a new product. Which situation would make the claim invalid?

Which types of evidence do these three diagrams represent?

A student recorded his pulse rate for 20 seconds. He repeated this two more times. In his data table, the results were recorded as 21 beats, 19 beats, and 14 beats. The student’s average pulse rate per minute was

A student placed one solution in a beaker and another solution inside a dialysis tubing bag that was suspended in the solution in the beaker. In which setup would the contents of the dialysis tubing bag turn blue-black after a few minutes?