Introns are areas that
Options:
- (A) it keeps an organism warm
- (B) Plant reproduction
- (C) the wearing away of rock
- (D) do not code for protein
- (E) Something coming from a gland
- (F) Plant growth is reduced
- (G) allow growth
- (H) produce offspring
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Let's think first: Introns are regions that do not code for proteins. An area is a rectangular region of cells. Introns are areas that do not code for proteins.... So the answer is [(D)]

Cancer and tumors are a result of specific types of:
Options:
- (A) organs
- (B) cigarettes
- (C) radiation
- (D) layers of fat
- (E) gene damage
- (F) rays or beams
- (G) Chemical energy
- (H) the skin
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Let's think first: Cancer is a disease in which cells divide out of control. With specific types of gene damage, the cell starts dividing out of control, forming a tumor. Cancer and tumors are a result of specific types of gene damage.... So the answer is [(E)]

The gene pool expands through fertilization and:
Options:
- (A) offspring
- (B) agriculture
- (C) mutation
- (D) babies
- (E) seeds
- (F) zygotes
- (G) relocation
- (H) competition
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Let's think first: Mutation creates new genetic variation in a gene pool. Fertilization increases genetic variation. Mutation and fertilization have similar effects on the gene pool.... So the answer is [(C)]