What is the complete set of all chromosomes of a cell of any living organism. they are often displayed in a photograph of chromosomes that have been grouped into matching pairs?

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.

Number and variety of living organisms includes genetic, species, and ecological types

How energy flows through each level in this energy pyramid. is all the matter and energy from one level transferred to the next level?