⦁ Do most of the finches have beak depths near the lower extreme, the middle, or the higher extreme of the range?

Near to the middle.

Explanation:

Most finches have beak depths close to the middle, which benefits the feeding and justifies the reason why most of these birds have this beak extension.

As you know, tendons are birds of the family of fringilids, they are known for having a very pleasant song, which allows people to wish to have them at home, as a pet.

They feed on grass seeds and insects. This type of food is benefited by the medium sized beak, allowing the tendons that have this type of beak to have survival advantages.