Examine the evolutionary tree below.This tree tells us that the amnion is found in ______.
A) lungfishes and amphibians
B) amphibians only
C) mammals, lizards, and snakes only
D) mammals, lizards, snakes, crocodiles, and birds

Question

Examine the evolutionary tree below.This tree tells us that the amnion is found in ______. 
A) lungfishes and amphibians 
B) amphibians only 
C) mammals, lizards, and snakes only 
D) mammals, lizards, snakes, crocodiles, and birds

Quizplus · Accepted Answer

The tree shows that the amnion evolved in the common ancestor of mammals, reptiles, and birds and is therefore found in these groups. It is not present in lungfishes or amphibians (represented by the outgroup on the tree).

Examine the Evolutionary Tree Below