In the study of animals, what does the term 'structure' refer to when describing a trait like a claw or a wing?

The job the trait does for the animal

The shape and physical makeup of the trait

How the animal uses the trait to communicate

The age at which the trait appears

If a bird's main diet consists of cracking open hard nuts and seeds, what kind of beak structure would be most advantageous for this function?

A long, thin beak for sipping nectar

A short, thick, and powerful beak

A flat, wide beak for scooping fish

A small, delicate beak for catching insects

The structure of a part is designed to effectively carry out its function.

An animal's function and structure are completely unrelated to each other.

The function of a body part changes daily, but its structure does not.

All animals have the same structures, but they perform different functions.