Which of the following examples best describes gene flow?

Question

Responses
A An isolated population of turtle is able to adapt and evolve due to mutations and random gene assortment found within the population.An isolated population of turtle is able to adapt and evolve due to mutations and random gene assortment found within the population.
B In a rabbit population, eye coloration includes brown, blue, gray, red, pink, and albino. A virus strain causes a terminal disease that wipes out a large portion of the rabbits. Purely by chance, the only rabbits left in the population have pink-colored eyes or gray-colored eyes.In a rabbit population, eye coloration includes brown, blue, gray, red, pink, and albino. A virus strain causes a terminal disease that wipes out a large portion of the rabbits. Purely by chance, the only rabbits left in the population have pink-colored eyes or gray-colored eyes.
C An area has two different populations of salamanders. One population contains only black and yellow salamanders, and one population contains only brown salamanders. After millions of years of separation between the two populations of salamander, a scientist introduces a black and yellow salamander into the population of brown salamanders. An area has two different populations of salamanders. One population contains only black and yellow salamanders, and one population contains only brown salamanders. After millions of years of separation between the two populations of salamander, a scientist introduces a black and yellow salamander into the population of brown salamanders.
D During a storm, fifteen birds of the same species are blown off course and end up on an island without any birds of that species. The birds thrive on the island and are able to quickly establish a new population there. After 500 years, the descendants of the original birds more closely resemble the original birds than the birds from mainland do.

Answer 1

C An area has two different populations of salamanders. One population contains only black and yellow salamanders, and one population contains only brown salamanders. After millions of years of separation between the two populations of salamander, a scientist introduces a black and yellow salamander into the population of brown salamanders.