When two separate species have body structures such as specific bones that are the same but the two species are very different these structures are known as

analogous structures
homologous structures
vestigial structures
embryological structures

The correct answer is option A, Analogous structures

Explanation:

Analogous structure develop in species that live in similar kind of environment even though the two species are extremely different from each other .Being developed under similar conditions,  the function and look of the analogous structures are more or less same. For example the wings in flying animals such as bats, birds, insects, and even fish are similar to each other not only in function but also in structure (wings of all these species is primarily composed of feathers, scales, hair)

clumped distribution, because you'de have all of the population gathered in a relatively small are.

it's the most common because it provides protection and a mate for reproduction

example: humans, seeweed, cattles, etc.

x would be the most and the least would be y because there are more fruit   and seeds than flock z has insects