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

thats not a question

the nitrogen cycle provides nitrogen to the ecosystem from the atmosphere, ground and oceans. nitrogen is an important component of complex molecules such as amino acids and nucleotides, which lead to the creation of proteins and dna, the building blocks of all life. plants absorb nitrogen in the form of ammonium, nitrate ion and, on rare occasions, as amino acids. animals receive nitrogen necessary for biological processes from feeding on living or dead organic matter.