Amarine biologist wants to determine the impact of warming oceans on the coral in great barrier reef. which option below best describes the population he will study?
all the oceans in the world
only the ocean in which the great barrier reef is found
coral in all the oceans of the world
only coral found in the great barrier reef

The marine biologist is obviously interested in the coral in the Great Barrier Reef - so studying other corals could introduce confusing data, therefore he or she will want to study

Only coral found in the Great Barrier Reef.

It can be assumed here that the ocean is not the target of the examination, because what is studied is the effect of the ocean warming up,to we can assume that this effect is already known