Snakes and similar animals are members of a group called reptiles how do reptiles differ from other animals?

a. they are cartilage instead of bones
b. they divide their time between living on land and living in water
c. they have skin covered with scales
d. they regulate their own internal temperature

i think it is dna, i'm not totally sure but i think it might be.

one part of the electromagnetic spectrum that arrives on earth as solar radiation from the sun is the visible spectrum. wavelengths of the visible spectrum combine to form what we refer to as

answer - d) ultraviolet radiation.

violet /   380–450 nm / 668–789 thz

violet is number 1 in the chart of visible light.