Apopulation has a small size, high level of genetic drift, and a very little mifration into the population. what will most likely happen to the genetic diversity in the population over time?

it is possible that some genotypes within the population may be lost , because the population is small and there is high genetic diversity with highly variable types of genes.This may lead to less reproduction within the population as organisms may die soon and no reproduction taking place will ultimately lead to the extinction of the given population.Due to less migration ,the population will not spread to other regions, to reproduce with similar genotypic organisms  and will hence be wiped off the surface of the earth.

Genetic diversity will decrease because existing alleles will be lost and few new alleles will be introduced.

Explanation:

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they had the law tat factories that produces smoke cannot be built near residential buildings.

building of proper sewage system was done to ensure that the waste is carried away from the humans so that they do not get diseases from it.

also they built water systems to provide water in those areas which are drought prone.