question... What supplement would a human take to aid in breaking down food?
Options:
- (A) sweating
- (B) Energy
- (C) Enzymes.
- (D) Calcium supplements.
- (E) Energy.
- (F) Antacid.
- (G) Protein supplement.
- (H) evaporation
answer... Digestion is the process of breaking down food into components the body can absorb. Digestive enzymes are necessary for a complete digestion. Enzymes break down food into components the body can absorb.
The answer is (C)

question... What produces spores that develop into gametophytes?
Options:
- (A) fungi
- (B) cacti
- (C) plants
- (D) ferns
- (E) Orchids
- (F) PDAs
- (G) barnacles
- (H) bushes
answer... Flowers produce spores that develop into gametophytes. Another interesting flower is the Orchid flower. Orchids produce spores that develop into gametophytes.
The answer is (E)

question... 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
answer...

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
Echinoderms lack respiratory and excretory systems. Starfish and sea urchins are also echinoderms. Starfish lack respiratory and excretory systems.
The answer is (F)