Competitive exclusion is based on the idea that Select one: a. all of these b. one species will hold some sort of advantage over the other one c. no two species can completely occupy the same niche d. the more two species overlap in their capacity to obtain and use resources, the less likely they are to coexist

Option A.

All of these.

Explanation:

Competitive exclusion state that or show that two organisms who compete for the same resource in the same habitat cannot occupy the same niche and cannot coexist because the stronger organism or superior one tend to outcompete the weaker organism thereby leading to the exclusion of the the weaker organisms. It is a principle in ecology also called Gause's law.

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.