q: How can an animal learn actions?
Options:
- (A) movement
- (B) Chemical energy
- (C) by fighting
- (D) through play
- (E) by eating
- (F) when they sleep
- (G) stamina
- (H) Riding a bike
a: (D)... Explanation: Behaviors can be learned through play. Kids imitate adult actions and behaviors. Actions can be learned through play. That's why the answer is (D).

q: Zooplankton are tiny animals that feed on what?
Options:
- (A) sunlight
- (B) vegetation
- (C) Energy
- (D) loose soil
- (E) plant life
- (F) diatoms
- (G) fungi
- (H) chemicals
a: (F)... Explanation: Zooplankton are tiny animals that feed on phytoplankton. Diatoms are the predominant phytoplankton. Zooplankton are tiny animals that feed on diatoms. That's why the answer is (F).

q: What is an example of a tetrapod vertebrate that produces amniotic eggs.
Options:
- (A) animals
- (B) tortoises
- (C) crocodiles
- (D) barnacles
- (E) insects
- (F) parasites
- (G) Lizards
- (H) a fish
a: (G)... Explanation: Reptiles are a class of tetrapod vertebrates that produce amniotic eggs. All lizards are reptiles. Lizards are tetrapod vertebrates that produce amniotic eggs. That's why the answer is (G).

q: What do all chemical changes require to occur?
Options:
- (A) during the day
- (B) heating liquids
- (C) Activation energy
- (D) wavelengths and photons
- (E) Burning fuel and air
- (F) kinetic energy
- (G) electromagnetic energy
- (H) direct energy
a:
(C)... Explanation: All chemical reactions require activation energy to get started. Chemical changes are a result of chemical reactions. All chemical changes require activation energy to occur. That's why the answer is (C).