What do we call species like wolves who have impact on so many other
species, whether the effects are direct
or indirect?
nroducers

A keystone species

Explanation: This makes their presence especially important. For this reason, wolves are considered a keystone species. Wolves exert both direct and indirect effects on their ecosystem; influencing their prey, their prey influencing the plant and animal species beneath them, and so forth down the chain.

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.