Question

multiple choice question
turtles and tortoises, lizards and snakes, tuataras, and crocodilians are the four main groups of
o amniotic amphibians.
o avian reptiles.
o nonamniotic amphibians.
o nonavian reptiles.

Explanation:

• Amniotic amphibians: Amphibians are not amniotes. Amphibians have a life - cycle that often involves a water - dependent larval stage. Amniotes have adaptations (like the amniotic egg) that allow them to reproduce on land. So this option is incorrect.
• Avian reptiles: Birds (avian) are a separate class (Aves) from reptiles. Reptiles are non - avian in the traditional sense when considering these four groups (turtles, lizards and snakes, tuataras, crocodilians). So this option is incorrect.
• Nonamniotic amphibians: As mentioned above, amphibians are non - amniotic, but the groups in the question (turtles, lizards and snakes, tuataras, crocodilians) are amniotes. So this option is incorrect.
• Nonavian reptiles: Turtles and tortoises, lizards and snakes, tuataras, and crocodilians are all part of the class Reptilia, and they are non - avian (birds are not included in these four groups).

Answer:

nonavian reptiles.