B is the answer hope i can help
Through the actions of alleles
The coral fossil would be a better estimate of past water depth. This is because most corals inhabit shallow water reefs, less than 150 feet deep. In contrast, pelagic fish may inhabit any open water (pelagic) part of the ocean, with depths ranging anywhere from a couple of hundred feet deep to miles in depth.
The answer is letter B has commercial uses such as Alcohol production and bread making.
