Which of the following would be the best way for an ecologist to determine the facts of an industrial waste chemical on the survival of a fish species

idk why hjggjhjkhj

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 : )