What makes a source relevant? It uses facts or data out of context.
It relies on facts or data that are old.
It relates to the subject or topic in a useful way.
It supports one point of view on a subject or topic.

the answer is d (apex) good luck : ))

what is the statement?

not necessarily. higher fitness requires the organism to be reproductive successful. for example, an organism at age 10 with 15 offspring is much more fit than an organism at age 15 with only 5 offspring.

d. organisms have cells with different shapes and functions.