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
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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)]

Mammals find breath through the action of what thing beneath their lungs?
Options:
- (A) matter
- (B) the skin
- (C) muscle
- (D) organ
- (E) lmestone
- (F) oxygen
- (G) gas
- (H) Epidermis
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Let's think first: Mammals breathe with the help of a diaphragm. Hiccups are caused by involuntary spasms of the diaphragm, the muscle beneath the lungs. Mammals breathe with the help of a muscle below the lungs.... So the answer is [(C)]

What happens in the archegonium?
Options:
- (A) eggs separate
- (B) Earth orbiting the Sun
- (C) sperm and egg fuse
- (D) competition
- (E) fallopian tubes join
- (F) permineralization
- (G) It expands
- (H) cloning
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Let's think first: Fertilization occurs when sperm swim to an egg inside an archegonium. Fertilization occurs when the egg and sperm fuse and join. An egg and sperm can fuse when sperm swim to an egg inside an archegonium.... So the answer is [(C)]

What wets the skin, and when it evaporates, it cools the body?
Options:
- (A) Heat energy
- (B) salt and water
- (C) acetic acid
- (D) urine
- (E) ice
- (F) Chlorophyll
- (G) white vinegar
- (H) blood
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Let's think first: Sweat wets the skin, and when it evaporates, it cools the body. Sweat is made of salt and water. Water and salt wets the skin, and when it evaporates, it cools the body.... So the answer is [(B)]

What kind of cell division produces sex cells in animals?
Options:
- (A) complex
- (B) insects
- (C) pollen
- (D) gametes
- (E) sexual division
- (F) meiosis
- (G) reproduction cells
- (H) seeds
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Let's think first: Meiosis is the type of cell division that produces gametes. Animals that reproduce sexually produce sex cells, or gametes. Meiosis is the type of cell division that produces sex cells.... So the answer is [(F)]

How do ants communicate to other ants to encourage them to follow?
Options:
- (A) Skywriting
- (B) Electrical energy
- (C) Using a phone to communicate
- (D) Leaving a written communicatio
- (E) Something coming from a gland
- (F) By wind and rain
- (G) Chemical energy
- (H) Leaving chemical trails
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Let's think first: Ants communicate with chemicals called pheromones. Physiologically, ants leave a trail of pheromones, which other ants then follow. Ants communicate by leaving chemical trails for other ants to follow.... So the answer is [(H)]