Q: Great egrets get food by doing what?
Options:
- (A) sleeping
- (B) eating other living things
- (C) Transfers energy
- (D) converting mass to energy
- (E) Something coming from a gland
- (F) photosynthesis
- (G) dying
- (H) competing for resources
A: So, my chain of thought: Heterotrophs get food by eating other living things. Great egrets are heterotrophs . Great egrets get food by eating other livings things. The answer is (B).

Q: What do dogs use to mark their territory?
Options:
- (A) water
- (B) Chemicals
- (C) layers of fat
- (D) food
- (E) Animal fur
- (F) heat energy
- (G) Scratches
- (H) heat produced
A: So, my chain of thought: Male dogs use pheromones in urine to mark their territory. Pheromones are a sub-category of semiochemicals. Male dogs use chemicals to mark their territory. The answer is (B).

Q: What is used as energy by most of the organisms on earth
Options:
- (A) sugar
- (B) heat
- (C) food
- (D) water
- (E) Light
- (F) Energy
- (G) salt
- (H) carbon
A:
So, my chain of thought: Glucose is used for energy by the cells of most organisms. Blood Sugar Glucose is sugar. Sugar is used for energy by the cells of most organisms. The answer is (A).