Question

Which of the following is not needed to make a model of the cycle.

An energy source
Water
A closed drain
A drain

Answer 1

i think this is C because a closed drain does nothing...its just a used to be drain that is closed is it not?

Answer 2

K thanks

Answer 3

i know it can't be the first 2 but...but let me research...

Answer 4

but it also says a model of THE cycle so is there a picture or anything i can look at?

Answer 5

and a closed drain is not the closed drain i was thinking...weird name though.