A is exhibited only when two are present together. recessive allele

hybrid

purebred

dominant allele

I believe it's a dominant allele

Explanation:

Recessive allele means one is present... A hybrid is the result of two different breeds breeding. A purebred is an organism that always passes down the same genetic makeup.

i think that the best answer would be c.

tell me if im wrong : )

the sphincter muscles at the end of the digestive tract is the anus.