[Q] What is one reason birds have covered bodies?
Options:
- (A) To help them burrow
- (B) They have thick fur
- (C) layers of fat
- (D) To help them fly
- (E) To keep their body heat.
- (F) To attract predators
- (G) with their fur
- (H) To make them heavier
[A] Here's my solution: Feathers help birds fly and provide insulation. Birds have bodies covered with feathers. Birds bodies are covered to help them fly and provide insulation. The answer is (D).

[Q] Where do most fungi get their protein?
Options:
- (A) protein synthesis
- (B) loose soil
- (C) swamp vegetation
- (D) alveoli
- (E) dead organisms
- (F) by indirect light
- (G) glycopeptides
- (H) carbon dioxide
[A] Here's my solution: Most fungi get organic compounds from dead organisms. Proteins are complex organic compounds. Most fungi get proteins from dead organisms. The answer is (E).

[Q] What is something that correlates with temperature change?
Options:
- (A) Lift
- (B) fronts
- (C) heat
- (D) wind
- (E) fever
- (F) sweat
- (G) Joules
- (H) stress
[A] Here's my solution: Temperature falls from lower to higher altitudes. Lift decreases with altitude. Lower temperatures align with lower lifts. The answer is (A).

[Q] _ is found in most molecules.
Options:
- (A) glucose
- (B) Gold
- (C) Energy
- (D) food
- (E) Polonium
- (F) Nitrogen
- (G) Helium
- (H) heat energy
[A]
Here's my solution: Nitrogen is found in proteins, nucleic acids, and chlorophyll. Most molecules are proteins or nucleic acids. Nitrogen is found in most molecules. The answer is (F).