A scientist is studying trace fossils of an early mammal. Which type of information can be learned from studying trace fossils? Choose the correct answer.

a. how many teeth the mammal had

b. the structure of the mammal's skeleton

c. information about the behavior of the mammal

d. how the mammal is related to modern mammals

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Explanation:

nn'n

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.