Mutation leads to _.
Options:
- (A) Devolution
- (B) Plants growth
- (C) rapid expansion
- (D) Evolution.
- (E) Degeneration
- (F) Extinction
- (G) massive damage
- (H) anemia
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Let's think first: Mutation creates new genetic variation in a gene pool. Genetic variation is the raw material for evolution. Mutation leads to evolution.... So the answer is [(D)]

What do catalysts do?
Options:
- (A) metabolic reaction
- (B) breathe
- (C) get chemical reactions started
- (D) Slowing the transfer of heat
- (E) A compound that donates proton
- (F) fertilize eggs
- (G) have a positive impact on the environment
- (H) inhibit chemical reactions
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Let's think first: All chemical reactions require activation energy to get started. Catalysts lower the activation energy for reactions. Catalysts help chemical reactions to get started.... So the answer is [(C)]

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)]