Scientists are now grouping reptiles with birds and mammals because they are all vertebrates that have a(n):
A) divided brain.
B) amniotic egg.
C) mammary gland.
D) jointed appendage.
E) epidermal covering.

Question

Quizplus · Accepted Answer

Reptiles, birds, and mammals are grouped together because they all have the capability to lay amniotic eggs. The amniotic egg is a key evolutionary adaptation that allows these animals to lay eggs on land without the risk of them drying out, unlike amphibians whose eggs must remain in water. This characteristic is not shared with the presence of mammary glands (specific to mammals) or a divided brain, jointed appendages, and epidermal coverings, which are more broadly shared across various animal groups.

Scientists Are Now Grouping Reptiles with Birds and Mammals Because