question... Which of the following do not grow using mitosis?
Options:
- (A) skin cells
- (B) genus
- (C) fungi
- (D) lung cells
- (E) blood cells
- (F) parasites
- (G) viruses
- (H) bacteria
answer... Populations of viruses do not grow through cell division because they are not cells. Mitosis is cell division. Populations of viruses do not grow through mitosis because they are not cells.
The answer is (G)

question... What harms the respiratory and circulatory systems?
Options:
- (A) oil
- (B) rain
- (C) sulfur
- (D) cars
- (E) tires
- (F) coal
- (G) tar
- (H) bicycles
answer... Air pollution harms the respiratory and circulatory systems. Cars are a significant source of air pollution. Cars harm the respiratory and circulatory systems.
The answer is (D)

question... Where does human fertilization naturally take place?
Options:
- (A) hard shelled egg
- (B) petri dish
- (C) bushes
- (D) man
- (E) Earth
- (F) eggs
- (G) woman
- (H) orchids
answer...
Fertilization takes place inside the female organism. Fatty tissue in a woman's body produces female hormones. Fertilization takes place inside a woman.
The answer is (G)