q: What kind of animals conserve energy with their hair or fur?
Options:
- (A) fur
- (B) bears
- (C) mammals
- (D) sweating
- (E) frogs
- (F) cactus
- (G) goats
- (H) humans
a: (C)... Explanation: Mammals conserve body heat with their hair or fur. Basically, heat is energy. Mammals conserve energy with their hair or fur. That's why the answer is (C).

q: What are organisms that make food for themselves and other organisms?
Options:
- (A) mushrooms
- (B) green plants
- (C) plants
- (D) mammals
- (E) agriculture
- (F) honeybees
- (G) photosynthesis
- (H) animals
a: (B)... Explanation: Producers are organisms that produce food for themselves and other organisms. Green plants are producers . Green plants are organisms that make food for themselves and other organisms. That's why the answer is (B).

q: What is the effect of a population suddenly getting much smaller?
Options:
- (A) major threat to health
- (B) Decreased precipitation
- (C) a lot of human deaths
- (D) movement of tectonic plates
- (E) it is unpredicatbale
- (F) If they can no longer get food
- (G) Plant growth is reduced
- (H) enormous damage to homes
a: (E)... Explanation: Bottleneck effect occurs when a population suddenly gets much smaller. Effects of bottlenecks are unpredictable . When a population suddenly gets much smaller the effects are unpredictable. That's why the answer is (E).

q: What forms when molecules react with one another?
Options:
- (A) biochemistry
- (B) Chemical energy
- (C) Energy.
- (D) atoms
- (E) chemical bonds
- (F) elements
- (G) flow of electrons
- (H) Organic compounds
a:

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
(E)... Explanation: Chemical bonds form when substances react with one another. All substances are composed of molecules. Chemical bonds form when molecules react with one another. That's why the answer is (E).