Evaporation of sweat uses energy, and the energy comes from body heat. Animals are inefficient energy converters. Animals produce body heat which is dissipated by sweat.
This justifies what answer for what question? Q & A: 
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How do animals dissipate body heat?
Options:
- (A) sweat
- (B) eat food
- (C) lay in the sun
- (D) insulation
- (E) coat
- (F) osmosis
- (G) fur
- (H) cooling
(A)
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