Biology

The correct answer is: C. feathers.

1. Analyze the position of each trait on the phylogenetic tree:

A.Tetrapod limbs: This trait is at a relatively lower branch point on the tree. It is an ancestral trait for amphibians, mammals, lizards and snakes, crocodiles, ostriches, hawks and birds. It evolved before the amnion and feathers.

B.Amnion: The amnion trait branches off after the tetrapod limbs trait. It is a characteristic of a group that includ...