I think the answer is D. GAA
The population of fish would slowly begin to die out as the deeper the water the less dissolved gasses there are.
I’n pretty sure the answer is supposed to be about the tectonic plates. The plates constantly shift the land creating holes/dips in the earth and mountains in other places.
The type of mutation that would cause the most dramatic change in the polypeptide or protein product of a certain gene is the base-pair deletion. A deletion is a mutation in which the part or the base is lost during the process of replication. Any number of nucleotides can be deleted from a single base to an entire piece of chromosome.
