When gardening what can be depleted of nutrients?
Options:
- (A) fertilizer
- (B) bacteria
- (C) the plant
- (D) coal
- (E) pine
- (F) the dirt
- (G) Acids
- (H) water
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Let's think first: Soil can be depleted of nutrients. Dirt is really misplaced soil. Dirt can be depleted of nutrients.... So the answer is [(F)]

What is the name of something some animals use to conserve water and elminate waste?
Options:
- (A) it keeps an organism warm
- (B) food and shelter
- (C) Exfoliation
- (D) an area swollen with pus
- (E) swamp vegetation
- (F) excretory structures
- (G) reusing materials
- (H) colder and wetter
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Let's think first: Some arthropods have special excretory structures. Terrestrial arthropods have an excretory system that conserves water and eliminates waste. Some animals have excretory structures that conserve water and elminate waste.... So the answer is [(F)]

Most people can survive only a few days without what?
Options:
- (A) carbon dioxide
- (B) oxygen
- (C) h2o
- (D) H20
- (E) NaCl
- (F) CO2
- (G) soda
- (H) urea
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Let's think first: Most people can survive only a few days without water. Water is everywhere H20. Most people can survive only a few days without H20.... So the answer is [(D)]