Developmental disorders are often caused by mutations in several genes. These type of genetic disorders are .
a. dominant
b. recessive
c. not inherited
d. polygenic

it would be f

explanation:

well the answer is 2!

the answer you are looking for is the united states forest service.

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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.