Scientists study animal behavior through which of the following?
Options:
- (A) audio and video tape
- (B) Electrical energy
- (C) irradiation
- (D) A computer
- (E) raising their temperature
- (F) Something coming from a gland
- (G) The bending of a ray of light
- (H) characteristics
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Let's think first: Ethologists usually study how animals behave in their natural environment. Many ethologists capture their observations on videotape or audio tape. Scientists who study how animals behave use videotape or audio tape.... So the answer is [(A)]

What kind of organism use cellulose for their cell walls?
Options:
- (A) parasites
- (B) animals
- (C) Conifers
- (D) fungus
- (E) vegetation
- (F) producers
- (G) amoeba
- (H) viruses
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Let's think first: Plants use cellulose for their cell walls. If the plant is green, it is a producer. Producers use cellulose for their cell walls.... So the answer is [(F)]

Organisms cluster around hot water inside cracks where?
Options:
- (A) loose soil
- (B) ocean floor
- (C) food and shelter
- (D) tectonic plates
- (E) the ground
- (F) allow growth
- (G) Absorb light
- (H) survive
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Let's think first: Organisms cluster around hydrothermal vents in the ocean floor. Background Hot water vents form inside cracks in the ocean floor. Organisms cluster around hot water inside cracks in the ocean floor.... So the answer is [(B)]

Most ecosystems need what?
Options:
- (A) invasive species
- (B) water
- (C) insects
- (D) food
- (E) tornadoes
- (F) recycling
- (G) plants
- (H) scientists
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Let's think first: Most ecosystems get energy from sunlight. Sunlight is turned into energy by plants. Most ecosystems need plants.... So the answer is [(G)]

Plants cell walls are made of
Options:
- (A) fiber
- (B) keratin
- (C) alveoli
- (D) cations
- (E) matter
- (F) CO 2
- (G) porous
- (H) Cane.
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Let's think first: Plants are multicellular eukaryotes with cell walls made of cellulose. Basically, fiber is cellulose . Plants cell walls are made of fiber.... So the answer is [(A)]

Mutations that lead to cancer usually effect genes that aid in what?
Options:
- (A) illness
- (B) health
- (C) disease
- (D) blood transfer
- (E) chemotherapy
- (F) respiraration
- (G) mitosis
- (H) recovery
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Let's think first: Mutations that lead to cancer usually occur in genes that control the cell cycle. Mitosis is part of the cell cycle. Mutations that lead to cancer usually occur in genes aiding in mitosis.... So the answer is [(G)]