The genetic variation within a species: gene pool or genetic diversity

I think it’s genetic diversity

Which description provides the best objective summary of the article in the passage?

Food webs - transferring energy and matter from one level to another. here you see four food webs. one or more are incorrect. which food web(s) show the correct sequence of organisms, from start to top level consumer? a) a b) d c) c d) a and d

In each transformation of energy , some energy what?