6. List four limitations of conducting toxicity testing in order to determine the safe exposure level for humans. In other words, none of our existing methods are perfect

What would happen to the nutrients in an ecosystem if decomposers, such as bacteria, didn’t exist there?

The diagram shows a fossil of an ancient whale skull and a skull of a present-day whale. the ancient whale is extinct and is believed to be an ancestor of the present-day whale. what do these skulls most likely show that supports darwin’s theory of evolution? all populations can adapt and survive. only some organisms have a common ancestor. populations change slowly over time. populations rapidly become extinct.

Mike has a problem with his testosterone. he is unable to produce enough. which will most likely be affected by his inability to produce testosterone? check all that apply.