The dumping of garbage caused the population of crabs in an area to drop from 2,000 to 500 .crabs eat algae and are preyed on by larger fish . How will the crabs population change affect these two species ?

explanation:

the fossil record extends back to a dog-like ancestor some 55 million years ago, which gave rise to the first horse-like species 55 to 42 million years ago in the genus eohippus.

i think the answer is gold im not entirely sure

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.