_carry signals that control sexual development and reproduction
Options:
- (A) sex hormones
- (B) electricity
- (C) nucleic acid
- (D) Most plants
- (E) animals
- (F) genes
- (G) dendrites
- (H) photons
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Let's think first: Sex hormones are chemical messengers that control sexual development and reproduction. Chemical messengers carry signals from one nerve branch to another. Sex hormones carry signals that control sexual development and reproduction.... So the answer is [(A)]

Populations that are biodiverse might be called:
Options:
- (A) homogenous enclaves
- (B) similar
- (C) animals
- (D) peachleaf willow
- (E) communities
- (F) bottlenecks
- (G) insects
- (H) fertile
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Let's think first: Communities consist of populations of different species. Biodiversity is a lot more than just the number of different plant and animal species. Communities consist of populations that are biodiverse.... So the answer is [(E)]

What do trees release during the day but not at night?
Options:
- (A) Energy
- (B) water
- (C) He
- (D) Ce
- (E) chemicals
- (F) Energy.
- (G) heat
- (H) oxygen
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Let's think first: Plants release oxygen during the day but not during the night. All plants are trees. Trees release oxygen during the day but not at night.... So the answer is [(H)]