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: So, my chain of thought: 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).

Q: A thing which is what produces eggs and sperm?
Options:
- (A) seeds
- (B) fertile
- (C) insects
- (D) organ
- (E) a fish
- (F) pollen
- (G) barnacles
- (H) sessile
A: So, my chain of thought: Adult sponges produce eggs and sperm. All adult sponges are sessile. A thing which is sessile produces eggs and sperm. The answer is (H).

Q: What kind of animal doesn't have a respiratory or excretory system?
Options:
- (A) a fish
- (B) bears
- (C) ant
- (D) whale
- (E) humans
- (F) starfish
- (G) mammals
- (H) llama
A:
So, my chain of thought: Echinoderms lack respiratory and excretory systems. Starfish and sea urchins are also echinoderms. Starfish lack respiratory and excretory systems. The answer is (F).