question... What has permeable skin?
Options:
- (A) goats
- (B) alligators
- (C) animals
- (D) apples
- (E) frogs
- (F) sharks
- (G) humans
- (H) snakes
answer... Amphibians have permeable skin that easily absorbs substances from the environment. All frogs are amphibians. Frogs have permeable skin that easily absorb substances in the environment.
The answer is (E)

question... For animals, displays of color can be viewed as:
Options:
- (A) spectrum
- (B) prudishness
- (C) rainbow
- (D) courtship
- (E) positive
- (F) harm them
- (G) produce light
- (H) Movement
answer... Courtship is behavior that is intended to attract a mate. Almost all animals display colors to attract a mate or to scare off a predator. Courtship can be manifested by displays of color.
The answer is (D)

question... What is proprioception part of?
Options:
- (A) tail fins
- (B) genus
- (C) fur seals
- (D) animals
- (E) athletes
- (F) movement
- (G) humans
- (H) balance
answer...
Balance is the ability to sense and maintain body position. Another name for sense of body position is proprioception. Balance involves proprioception ability.
The answer is (H)