[Q] Emphysema is often cause by exposure to:
Options:
- (A) high temperature
- (B) fog
- (C) Greenhouse gasses
- (D) rays or beams
- (E) hot steam
- (F) tobacco smoke
- (G) Pollution
- (H) incendiary people
[A] Here's my solution: Lung cancer is most often caused by exposure to tobacco smoke. Many patients with lung cancer also have emphysema. Enphysema is often caused by exposure to tobacco smoke. The answer is (F).

[Q] What feature allows frogs to absorb substances from the environment?
Options:
- (A) four limbs
- (B) poison dart frog
- (C) hydrate their cells
- (D) permeable skin
- (E) layers of fat
- (F) a cuticle
- (G) predators
- (H) double eyelid
[A] Here's my solution: Amphibians have permeable skin that easily absorbs substances from the environment. All frogs are amphibians. Frogs have permeable skin that easily absorbs substances from the environment. The answer is (D).

[Q] Viral envelopes are sometimes made of fats and what?
Options:
- (A) cellulose
- (B) glucose
- (C) Energy.
- (D) protein
- (E) viral particles
- (F) Energy
- (G) food
- (H) bacteria
[A] Here's my solution: Some viruses have an envelope of phospholipids and proteins. Phospholipids are body fats, too. Some viruses have an envelope of fats and proteins. The answer is (D).

[Q] Macroevolution most likely occurs over what period of time?
Options:
- (A) Summer
- (B) length
- (C) eons
- (D) long
- (E) growth
- (F) Earth
- (G) years
- (H) scale
[A]
Here's my solution: Macroevolution occurs over geologic time above the level of the species. All geologic time can be divided into two eons. Macroevolution occurs over eons. The answer is (C).