Not every evosystem has large areas of similar vegetation, as the habitats in you study do. I'm areas where patches of more visually varied habitats exist, individual snails regularly move into or out of different visual surroubdings

High diversity of organisms are present.

Explanation:

Due to the existence of varied habitats in the ecosystem, there is high diversity of organisms in that ecosystem because there are different types of habitats are present in that ecosystem. Due to presence of more habitats for organisms and suitable conditions, different types of organisms lives in that one ecosystem which increases the diversity of that ecosystem. If the ecosystem has only one type of habitat, then the ecosystem will be less diversified as compared to ecosystem having varied habitats.

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.