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 amnion is a feature shared by all tetrapods that lay eggs on land (amniotes), including mammals, lizards, snakes, crocodiles, and birds. This is indicated by the fact that the amnion node on the tree is nested within the tetrapods node, which includes all of these groups. Lungfishes and amphibians, on the other hand, do not have the amnion and are not part of the amniotes group.

Examine the Evolutionary Tree Below