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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.

When ash and dust begin to settle on the ground, they eventually become compacted by

In general, characteristics that an organism survive and reproduce become more common in a population over time. what mechanism of evolution cause this change?