Which characteristics is common to all three groups of reptiles? a. use claws for defense. b. they protect their eggs. c. they have moveable eyelids. d. they are ectotherms. 99 points

The characteristic that is common to "all three groups of reptiles" is that they are all ectotherms.

Explanation:

Almost all the reptiles are referred to as 'ectotherms' because they are all cold-blooded. They adjust their body temperature according to the temperature of the surrounding. Reptiles like snakes do not have claws or eyelids. Moreover, not all reptiles protect their eggs. The "sea turtles" lay eggs on the seashores and go back to the seas. Thus, the only common characteristic among all the reptiles is that they are all ectotherms.