Q: Changes in what are essential for evolution to occur.
Options:
- (A) color of leaves
- (B) genetic material
- (C) learned behavior
- (D) synthetic material
- (E) the body's largest organ
- (F) acquired characteristics
- (G) sensory neurons
- (H) Most plants
A: So, my chain of thought: Mutations are essential for evolution to occur. Mutations are changes in the genetic material. Changes in the genetic material are essential for evolution to occur. The answer is (B).

Q: What can live in salt water?
Options:
- (A) otters
- (B) spider
- (C) amoeba
- (D) clam
- (E) alligator
- (F) ducks
- (G) goldfish
- (H) voles
A: So, my chain of thought: Mollusks live in most terrestrial, freshwater, and marine habitats. Mollusks tend to be shore-dwelling creatures. Clams tend to be shore-dwelling creatures and can live in both sea and freshwater. The answer is (D).

Q: What disrupts the cycle between organisms and the atmosphere?
Options:
- (A) burning coal
- (B) Sulfur dioxide
- (C) replanting forests
- (D) solar system
- (E) Greenhouse gasses
- (F) chlorofluorocarbons
- (G) life cycle
- (H) deforestation
A:
So, my chain of thought: Carbon cycles quickly between organisms and the atmosphere. Deforestation also disrupts the Carbon Cycle. Deforestation disrupts the cycle between organisms and the atmosphere. The answer is (H).