Mutations arise from A) mistakes in copying DNA from a parent when eggs or sperm are made. B) exchanging of proteins during fertilization. C) encoding of ribosomes during DNA generation. D) faulty functioning of amino acid

the element that provides strength to the exoskeletons of clams and oysters is phosphorus.

this is so because calcium carbonate is the main component in the shells. calcium carbonate is strengthened by phosphorus.

explanation:

it's     c       this is a cell (b) with a nucleus (c) containing dna (a). the dna is organized into chromosomes (d). a section of the chromosome that codes for a trait is called a gene (e).