Which is a requirement for life?
Options:
- (A) glucose
- (B) hydration
- (C) sunlight
- (D) scandium
- (E) recovery
- (F) oxygen
- (G) uranium
- (H) radon
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Let's think first: Oxygen is essential for cellular respiration for all aerobic organisms. Cellular respiration is a requirement for life. Oxygen is a requirement for life.... So the answer is [(F)]

What has a life cycle that includes alterations of generations?
Options:
- (A) apple
- (B) trees
- (C) salmon
- (D) Spruce
- (E) insects
- (F) animals
- (G) Cane.
- (H) bees
--
Let's think first: All plants have a characteristic life cycle that includes alternation of generations. Many of the plants are fruit trees. All trees have a characteristic life cycle that includes alternation of generations.... So the answer is [(B)]

What affects the respiratory and circulatory systems in the body?
Options:
- (A) HIV
- (B) sulfur
- (C) smog
- (D) stress
- (E) fever
- (F) sweat
- (G) heat
- (H) tar
--
Let's think first: Air pollution harms the respiratory and circulatory systems. An example of an air pollution reaction is the production of photochemical smog. Smog harms the respiratory and circulatory systems.... So the answer is [(C)]

How can behavior be learned?
Options:
- (A) by inheriting them
- (B) competition
- (C) An object is seen
- (D) by staying away from others
- (E) by ignoring others
- (F) Riding a bike
- (G) firm hugs
- (H) through games
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Let's think first: Behaviors can be learned through play. Ian plays role playing games. Behaviors can be learned through games.... So the answer is [(H)]

Some insets can use their antennae to detect what?
Options:
- (A) light waves
- (B) photons
- (C) Electrical energy
- (D) vibrating air
- (E) new lands
- (F) water sources
- (G) bending light rays
- (H) electricity
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Let's think first: Some insects can use their antennae to detect sound. When ears detect the vibrating air, signals are sent to the brain that are interpreted as sounds. Some insets can use their antennae to detect vibrating air.... So the answer is [(D)]

What can be a source of food for many species of fish?
Options:
- (A) Fully cooking the oysters
- (B) Organic compounds
- (C) beef
- (D) fishing poles
- (E) sessile organisms
- (F) barnacles
- (G) grass
- (H) gastropod shells
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Let's think first: Sponges are a source of food for many species of fish. Most sponges are sessile. Sessile organisms can be a source of food for many species of fish.... So the answer is [(E)]