i think it is D, she has already constructed the hypothesis and needs is performing the experiment. there is not much of an observation stage because she is looking at a distant end result in a set time frame.
Since fish feeds primarily on large amphipod,
therefore what we expect to remain to evolve on ponds containing fish would be
smaller amphipod or crustacean. Then correct answer to this question would be:
<span>“Ponds with fish should have smaller amphipods.”</span>
