Please help me with my question I will like and mark as brainliest

then that particular organisms become extinct.

well, that's easy; the answer's c, "it reduces contamination of the water and substrate of the estuary."

c) 50% there are four chromosomes. after crossing over, 2 of the four have been changed. that means any gamete has a 2 in 4 chance or 50% chance of receiving the mutated chromosome.