Answer:
A - Crest, B - amplitude, C - wavelength, D - trough
Explanation:
Well, if I understand correctly, I think it'd be 60, because 60+60= 120, but I may be wrong. It's not my best subject, but why not try to help even though I suck lol.
Its when the animal repeats what it is taught similar to a child you never really teach them to lie it just happens because they have seen other people do it
