15 !

describe the relationship of the atoms shown by:

a) the rearrangement of atoms is a chemical change
eliminate
b) stability of the atoms in the molecule means a physical change
c) a change in state of matter from a liquid to gas is a physical change.
d) a change in state of matter from liquid to solid is a physical change.

the answer is d.) homologous; have mammary glands

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.

c is the correct answer!