q: What does an animal like a mollusk lack that many other animals have?
Options:
- (A) sensory neurons
- (B) Energy.
- (C) Bodily water
- (D) kinetic energy
- (E) alveoli
- (F) the skin
- (G) an organism's body
- (H) spinal column
a: (H)... Explanation: Mollusks are invertebrates such as the common snail. Invertebrates are animals who lack a backbone or spinal column. Mollusks are animals who lack a backbone or spinal column. That's why the answer is (H).

q: If not managed properly, nutrients can be depleted on
Options:
- (A) environment
- (B) Dehydration
- (C) fronts
- (D) our planet
- (E) coastlines
- (F) the skin
- (G) farmland
- (H) Power plants
a: (G)... Explanation: Soil can be depleted of nutrients. Wampanucket soils are prime farmland soils. Farmland can be depleted of nutrients. That's why the answer is (G).

q: Mutation leads to _.
Options:
- (A) Devolution
- (B) Plants growth
- (C) rapid expansion
- (D) Evolution.
- (E) Degeneration
- (F) Extinction
- (G) massive damage
- (H) anemia
a: (D)... Explanation: Mutation creates new genetic variation in a gene pool. Genetic variation is the raw material for evolution. Mutation leads to evolution. That's why the answer is (D).

q: What increases the productivity and stability of the entire global system?
Options:
- (A) important habitats
- (B) Plants growth
- (C) solar system
- (D) animals
- (E) biodiversity
- (F) environment
- (G) bottlenecks
- (H) power stations
a:
(E)... Explanation: Biodiversity increases the productivity and stability of ecosystems. Marine ecosystems also act as stabilizers of global systems especially our climate. Biodiversity increases the productivity and stability of the entire global system. That's why the answer is (E).