Q: Which animal has a backbone?
Options:
- (A) camels
- (B) snail
- (C) bats
- (D) cricket
- (E) a fish
- (F) bird
- (G) koalas
- (H) octopus
A: So, my chain of thought: Birds are endothermic tetrapod vertebrates. Animals with backbones are called vertebrates. All birds have backbones. The answer is (F).

Q: Where does energy enter into in the form of sunlight and chemical compounds?
Options:
- (A) sun
- (B) science lab
- (C) biomes
- (D) orchids
- (E) photons
- (F) deserts
- (G) black hole
- (H) trees
A: So, my chain of thought: Energy enters ecosystems in the form of sunlight or chemical compounds. Biomes are global ecosystems. Energy enters biomes in the form of sunlight or chemical compounds. The answer is (C).

Q: _ is how organisms grow and repair themselves.
Options:
- (A) complex
- (B) recycling
- (C) properties
- (D) fusion
- (E) fission
- (F) bacteria
- (G) Mitosis
- (H) potatoes
A:
So, my chain of thought: Cell division is how organisms grow and repair themselves. Mitosis is cell division. Mitosis is how organisms grown and repair themselves. The answer is (G).