Gills
adaptation
Snakes are reptiles, and all reptiles lay eggs. That is a basic characteristic of reptiles.
One characteristic all reptiles share is that they are all cold-blooded.
ADAPTATION
Physical or Behavioral.
adaptation
It's a adaptation.
Adaptation
Large, active reptiles, such as non-avian dinosaurs, went extinct before the start of the Cenozoic. Hence, dinosaurs, pterosaurs, and other such reptiles are not characteristic of the Cenozoic.
ADAPTATION
adaptation
An adaptation to the environment.