Can anyone explain why option D is wrong?
I took a hint from “that might later be used in humans” and figured that animals are used before humans, and hence are precedents
I think you’re confusing the meaning of precedents.
How come??
The better answer is ‘substitute’. ‘Precedent’ also fits the sentence but so does ‘examples’ and they are synonyms.
Yaa, that makes sense but still, the answers are a lil too confusing
Nvm, can’t really argue with ETS so…