Chain-of-thought: Heterotrophs are living things that cannot make their own food. All animals are heterotrophic and obtain their food from plants. Animals obtain their food from plants and cannot make their own food.
Q: What obtain their food from plants and cannot make their own food?
Options:
- (A) bacteria
- (B) Flowers
- (C) trees
- (D) lichen
- (E) animals
- (F) fungi
- (G) humans
- (H) grass
A: (E)
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Chain-of-thought: Reproduction is the process by which living things give rise to offspring. Most people want to have children who are the biological offspring of both parents. Reproduction is the process by which living things produce children.
Q: What comes from reproduction?
Options:
- (A) babies
- (B) protein
- (C) pollution
- (D) dead cells
- (E) Energy
- (F) seeds
- (G) Most plants
- (H) children
A: (H)
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Chain-of-thought: Fish have a circulatory system with a two-chambered heart. Fish species include salmon and trout. Salmon and trout have a circulatory system with a two-chambered heart.

Q: What has circulatory system with a two-chambered heart?
Options:
- (A) sharks
- (B) trout
- (C) pan
- (D) toads
- (E) Birds
- (F) animals
- (G) mammals
- (H) Man
A: (B)
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