Scientists hypothesize that a certain species of animal existed in the past but fossils of the species have never been found which two statements could explain why a. minerals seeped into their bones. b. there were very few members of the species c. their bodies decomposed quickly d. their bodies contained radioactive atoms.

thinking it would be d not too sure but i think it's right

which

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.