"How many eyes does a spider have?" is not accepted?
I think in that case you would just use the topic/subject maker after spider, and not need the counter. I'm thinking since a counter was used, a number is expected in the sentence.
I know, right? And I go to Korean school.
What is the use of 개 in this sentence?
universal counter. for eyes, in this case
It's a counter for 눈
Can someone please shed some light on when to use 몇 개 versus 얼마나 많이? I seem to always pick the wrong one :-/