Why is C wrong?

Hi @andreaskormusis, Thanks for the question! So let’s recap what the relevant part of the stimulus is saying. We’re told that for all species of higher animals, reproduction requires production of eggs but not necessarily sperm. So some species have members that are all female. Now we’re being asked for something that COULDN’T be true, since this is a could be true except question. And (C) tells us that it could be true that there’s a significant number of female-only species of higher animals. Well, what’s significant mean? Depends on the context. Maybe just having one of these female-only species is a significant number. We don’t know, but we definitely can’t rule out the possibility. And since the possibility’s still there, it’s possible that “some” species is enough to be “significant,” and so (C) could be true and is the wrong answer. Hope this helps! Feel free to ask any other questions that you might have.

Ahhh I see, I read the first sentence a bit wonky. I was going by the understanding that it was referring to Higher Species to say that the groups with only females were of a lower species and thats why it was possible. Need to read more carefully, thanks!

No worries, glad you figured it out!