Aheterozygous person has the same as phenotype as a person who is homozygous for the allele

A person with a heterozygous genotype for a given trait will have the same phenotype as a person who is homozygous for the dominant allele.

option a and d is the correct answer

i hope this u

plz mark as the brainliest answer

well, that's easy; the answer's c, "it reduces contamination of the water and substrate of the estuary."