What is the ultimate source of genetic variability?

A. Gene flow
B. Mutations
C. Genetic drift
D. Non-random mating

b. mutations

Explanation:

Mutations can alter single nucleotides or entire chromosomes, and they are the sole source of new alleles. The ultimate source of genetic variation is mutation- changes in nucleotide sequences in the DNA.

poor water quality affects most estuarine organisms, including commercially important fish and shellfish. the pollutants that have the greatest impact on the health of estuaries include toxic substances like chemicals and heavy metals, nutrient pollution (or eutrophication), and pathogens such as bacteria or viruses.

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