Fusion ___ nuclei of atoms to form larger molecules and Fission nuclei to form smaller particles.

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.

Which units ate used to measure both velocity and speed? check all that apply

There are only about 250,000 known fossil species. true or false