Which of the following statements regarding fins on fishes is true?
a. fins evolved so that fish could swim better.
b. fins resulted from a mutation caused by a movement from land to water.
c. fins are an adaptation that aid in swimming.
d. fins came about because animals couldn't live in water without them.

The answer is B

Explanation:

i think i can answer even without the example. over time with environmental changes, sometimes a group of animals will adapt to better survive. take a moth for example. if the trees the moths use to camouflage themselves from predators, started to die or change colors themselves, the moths may, overtime of course, change color too. its just adapting to its surroundings. hope i was of any : )