Contrary to popular belief, extinction is a common phenomenon in nature; in fact, the majority of the species that
have existed on our planet are already extinct, with most disappearing long before Homo sapiens evolved.
A-have existed on our planet are already extinct, with most
B-have existed on our planet have already become extinct and most are
C-existed on our planet have already become extinct, most of which have
D-exist on our planet have already become extinct, most
E- exist on our planet are now extinct, with most
OA is
I was wondering...how can "have existed" be ok in this sense. Doesn't that have in the sentence make have existed a present perfect tense? And with that, implies that the species do exist? I thought that present perfect meant an ongoing event.
I guess what I am trying to say is: The species that are extinct can no longer exist, so why the have?
i chosen B. i dont know whats wrong with B. could you please explain it bit further. lets quantify the scenario. God sent 100 species at first to earth. out of 100, 80 have become extinct before before introducing homo sapiens. umm....now it is seems a bit clear to me. the intended meaning is distorted. it means 80 species have already extinct and the process is continuing BUT the intended meaning is that Homo sapiens is 101th species. so when homo sapiens is introduced 80 species dont existed on earth......please clarify me. am i right or wrong.