You have learned that both biotic and abiotic factors affect ecosystems. give some examples of each, and explain how biotic and abiotic factors could have affected the tortoises that darwin observed on the galápagos islands.

Animal bodies (and even plant bodies for that matter) are complex enough that life couldn't exist without enzymes. enzymes are usually large, complex biological catalysts that are expensive to make. enzymes speed up the rate of chemical reactions without being used up during the reaction (they can be reused many times). they are highly specific in the reactions they regulate. knowing what enzymes are and how they function, why does this explain why complex life forms could not exist if there were no enzymes.

According to the cladogram, which organisms have roundworms as a common ancestor?

Ture or false evidence for evolution includes millions of fossils