Frogs hear with their _______

lining of their mouth
tongue
tympanum
nostrils***

I'm not so sure about this question. I went back and looked in my book but i can't find anything, I searched it to and still couldn't find anything. Could someone please help me better understand this question?

3 answers

No.

http://frogsaregreen.org/learning-how-frogs-see-and-hear/
Ok thank you that article helped, the answer is C
Yes, C. You're welcome.