안녕하세요!

네 맞아요! 문제 설명하면서 제가

"the reason this is wrong is because every other mammal contain this gene as well" 이라고 했죠?

The ancestors of chimpanzees, orangutans, humans were unique in developing a deletion

which rendered the gene ineffective in producing ascorbic acid.

These particular primates are the ones that are different from the majority of animals.

Every other animal mentioned, including elephant, mice, and lemurs, are from the main branch of evolution

which contain animals that have a functioning GULO gene.

Therefore it would be wrong to state the lemurs "developed an ability to produce an active GULO protein"

열공하시고 혹시 또 질문이 생기면 게시판에서 만나요! :D