Sweat cools the body when it
Options:
- (A) Movement of an air mass
- (B) dry conditions
- (C) heat produced
- (D) Decreased precipitation
- (E) hydration
- (F) It expands
- (G) the environment
- (H) turns into a gas
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Let's think first: Sweat wets the skin, and when it evaporates, it cools the body. Evaporation is when a liquid turns into a gas. Sweat cools the body when it turns into a gas.... So the answer is [(H)]

Neurons are the structural and functional units of where what is critical?
Options:
- (A) organs
- (B) Glial cells
- (C) nerves
- (D) Structural units
- (E) voltage
- (F) Storage units
- (G) Critical care
- (H) A computer
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Let's think first: Neurons are the structural and functional units of the nervous system. Glial cells perform critical functions in the nervous system. Neurons are the structural and functional units of where the glial cells perform critical functions.... So the answer is [(B)]

Crustaceans and insects have what special structures?
Options:
- (A) the eyes
- (B) a cuticle
- (C) internal
- (D) excretory
- (E) invisible
- (F) Chlorophyll
- (G) fur and fat
- (H) muscled
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Let's think first: Some arthropods have special excretory structures. Crustaceans are, like insects, arthropods. Crustaceans and insects have special excretory structures.... So the answer is [(D)]