(Question)
Q: What disease associated with smoking involves breakdown of walls of the alveoli, resulting in less gas exchange by the lungs? Choices: - leukemia - cancer - pneumonia - emphysema A:
(Answer)
emphysema

(Question)
Q: What develops in depressions where water flow is low or nonexistent? Choices: - swamps - ponds - sinkholes - bogs A:
(Answer)
bogs

(Question)
Q: What do all chemical reactions need to get started? Choices: - expression energy - kinetic energy - potential energy - activation energy A:
(Answer)
activation energy