Q: Fact 1: Evaporation of sweat uses energy, and the energy comes from body heat. Fact 2: When sweat comes in contact with the skin it is cooled as the sweat evaporates. Given the two facts above, what evaporates from the skin?

Possible answers:
[1]. energy
[2]. Water
[3]. solutes
[4]. h2o
[5]. pus
[6]. sweat
[7]. rain
[8]. phlegm
A:
[6].