What can decompose a bow?
Options:
- (A) Acids
- (B) Oak
- (C) CO 2
- (D) pine
- (E) erosion
- (F) Wind
- (G) water
- (H) Fungi
--
Let's think first: Fungi are the only organisms that can decompose wood. Bows are wood, and wood breaks. Only fungi can decompose bows.... So the answer is [(H)]

What do mussels eat?
Options:
- (A) bivalves
- (B) sub-units of species
- (C) Something coming from a gland
- (D) mussels
- (E) plankton and nonliving organic
- (F) Something made from fermented ricce
- (G) mollusks
- (H) Microscopic organisms
--
Let's think first: Bivalves feed on plankton and nonliving organic matter. Mussels are bivalve mollusks. Mussels eat plankton and nonliving organic matter.... So the answer is [(E)]

What animal gives live birth?
Options:
- (A) humans
- (B) goats
- (C) alpacas
- (D) rabbit
- (E) babies
- (F) fur seals
- (G) mammals
- (H) sharks
--
Let's think first: Fertilization takes place inside the female organism. Sharks have internal fertilization, and most give birth to live young. The female shark will give live birth.... So the answer is [(H)]

Soil can be depleted of a thing that fertilizers can what to soil?
Options:
- (A) grow
- (B) add
- (C) loss
- (D) pH
- (E) harm
- (F) corn
- (G) peat
- (H) kill
--
Let's think first: Soil can be depleted of nutrients. Fertilizers add nutrients to the soil. Soil can be depleted of what fertilizers can add to soil.... So the answer is [(B)]

Mussels have what?
Options:
- (A) seaweed
- (B) arms
- (C) Energy
- (D) a shell
- (E) warmth
- (F) bacteria
- (G) Length
- (H) legs
--
Let's think first: Most mollusks have shells. Mussels are bivalve mollusks. Mussels have shells.... So the answer is [(D)]

Male dogs use_ in urine to mark their territory.
Options:
- (A) ammonia
- (B) Chemical energy
- (C) proteins
- (D) semiochemicals
- (E) animals
- (F) heat produced
- (G) nitric oxide
- (H) They have thick fur
--
Let's think first: Male dogs use pheromones in urine to mark their territory. Pheromones are a sub-category of semiochemicals. Male dogs use semiochemicals in urine to mark their territory.... So the answer is [(D)]