Why do plants that are pollinated by animals often bright colored or have a strong smell?

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.

Compare the composition of the moon's surface with the composition of the earth's surface.

Which example would the nurse consider to be a part of systems thinking theory?