After which event has evolution occurred?
a. a new predator comes into an environment
b. an individual is born with 6 fingers on one hand instead of 5
c. an animals white winter coat is replaced by a darker coat in the spring
d. an allele frequency in a population changes over time

answer: accepted answer: aquatic animals use the oxygen dissolved in water to carry out respiration. since the amount of dissolved oxygen in water is low as compared to the amount of oxygen in the air, therefore the rate of breathing in aquatic animals is much faster than it is in terrestrial animals.

explanation:

genetic variation can be caused by mutation (which can create entirely new alleles in a population), random mating, random fertilization, and recombination between homologous chromosomes during meiosis (which reshuffles alleles within an organism's offspring).

idk why hjggjhjkhj