Which type of diversity refers to the amount of variation in the gene pool of a species?
logical diversity
divers

Genetic biodiversity is a  type of diversity which refers to the amount of variation in the gene pool of a species.

Explanation:

Genetic diversity can be described as the variations in the genome of organisms which belong to the same species. Genetic diversity arises due to crossing over, independent assortment and mutations. The variations caused by these methods might be able to make the organism better to live in an environment. The organisms with favourable traits are more favoured by the environment and can pass on their characteristics to their offspring.

i'm thinking (a) to keep sand in place; ////////////

explanation: a sand fence or sandbreak, like a snow fence, is used to force windblown, drifting sand to accumulate in a desired place. sand fences are employed to control erosion, sand dune stabilization, keep sand off roadways, and to recruit new material in desert areas.