Why is s. aureus such a virulent organism? what conditions can it cause? what about the organism can lead to so many different kinds of infection/disease?

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.

What did hunter gathers do to alter the environment?

Ture or false evidence for evolution includes millions of fossils