An example of a human disorder that is caused by a dietary deficiency rather thand heredity is? 1. Phenylketonuria 2. Sickle-cell anemia 3. Gaiter 4. Tay-sachs disease

Goiter

Explanation:

Phenylketonuria, Sickle-cell anemia, Tay-sachs disease are human disorders that are caused by heredity. Goiter, which must have been misspelt as “Gaiter” in the question is an example of human disorder that is caused by dietary deficiency.  

Goiter is a condition in which the thyroid gland becomes swollen or enlarged. Goiter is usually caused as a result of iodine deficiency in the diet a person gets.

explanation:

b,bacteria convert nitrates

into nitrogen gas.

d,plants and animals take in

and use nitrogen compounds.

e,bacteria break down waste    

products and return nitrogen  

to the soil.

a,bacteria convert atmospheric

nitrogen to ammonia.

c,bacteria convert ammonia

to nitrites and nitrates.

c should be the answer