Which of the choices below is a type of hormone that acts on neighboring cells without entering the bloodstream? 1. local hormone 2. paracrine 3. autocrine 4. circulating hormone?

Both 1 and 2 (Local hormones and Paracrine) are types of hormones that act on neighboring cells without entering the bloodstream.

b is the best answer for this question.

multiple allele inheritance is traits controlled by more than 2 alleles (ex: pigeons having 3 alleles of one gene govern their feather color).   so the answer is a.