Most people can survive only a few days without what?
Options:
- (A) h2o
- (B) urea
- (C) CO2
- (D) beds
- (E) houses
- (F) air
- (G) NaCl
- (H) H20
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Let's think first: Most people can survive only a few days without water. H20 Bottled water was generally consumed last year. Most people can survive only a few days without H20.... So the answer is [(H)]

Girls have used what to learn behaviors for generations?
Options:
- (A) Birds
- (B) trees
- (C) rainbows
- (D) sound
- (E) alleles
- (F) bows
- (G) nerves
- (H) dolls
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Let's think first: Behaviors can be learned through play. Girls have played with dolls for generations. Girls have used dolls to learn behaviors for generations.... So the answer is [(H)]

In order to attract flies, wasps, and bees, what does a flower employ?
Options:
- (A) petals
- (B) colors
- (C) insects
- (D) camouflage
- (E) Energy
- (F) scentless
- (G) lack of color
- (H) pollen
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Let's think first: Petals attract pollinators to the flower. Pollination is by flies, wasps, and bees. Petals attract flies, wasps, and bees to the flower.... So the answer is [(A)]

Most ecosystems get energy from what in the atmosphere?
Options:
- (A) fires
- (B) Sun
- (C) wind
- (D) summer
- (E) oxygen
- (F) Light
- (G) heat
- (H) H20
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Let's think first: Most ecosystems get energy from sunlight. On Earth, energy from sunlight heats the atmosphere more at the equator than at the poles. Most ecosystems get energy from heat in the atmosphere.... So the answer is [(G)]

What do things that cannot make their own food need as a nutrient?
Options:
- (A) Energy
- (B) metal
- (C) animals
- (D) mud
- (E) Energy.
- (F) protein
- (G) prototype
- (H) fungi
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Let's think first: Heterotrophs are living things that cannot make their own food. Proteins are an essential nutrient for heterotrophs . Living things that can't make their own food need protein.... So the answer is [(F)]

What increases the productivity and stability of the entire global system?
Options:
- (A) important habitats
- (B) Plants growth
- (C) solar system
- (D) animals
- (E) biodiversity
- (F) environment
- (G) bottlenecks
- (H) power stations
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Let's think first: Biodiversity increases the productivity and stability of ecosystems. Marine ecosystems also act as stabilizers of global systems especially our climate. Biodiversity increases the productivity and stability of the entire global system.... So the answer is [(E)]