OPT:
[I] scarce resources;
[II] storing water;
[III] wasted water;
[IV] body water;
[V] Bodily water;
[VI] erosion;
[VII] flooding;
[VIII] reduced heat;

Fact 1: Lakes are formed by precipitation and runoff. Fact 2: Runoff water is wasted water. Given the two facts above, lakes are formed by precipitation and what?
Answer:
[III]