15. Why is an enzyme's shape important for the process of a chemical reaction:

Why is shape important? The shape of an enzyme is very important because it has a direct effect on how it catalyzes a reaction. An enzyme's shape is determined by the sequence of amino acids in its structure, and the bonds which form between the atoms of those molecules.

any abiotic or biotic factor in an ecosystem that causes a population's size to slow or decrease is a limiting factor.

sex cells are usually half's then they find another half and make a fertilize egg