An allele that expresses itself in a heterozygote is a(n) A. recessive allele

B. allele pair

C. dominant allele

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:

the answer is a) cell division.

hope this !

im not intirely sure but i think the anwser is d relative humidity