q: What is larger than ponds?
Options:
- (A) rivers
- (B) deltas
- (C) H 2 O
- (D) loch
- (E) toads
- (F) drop
- (G) puddle
- (H) bird bath
a: (D)... Explanation: Lakes are generally bigger and deeper than ponds. Scotland s lochs , including the famous Loch Ness, are glacial lakes. Lochs are bigger and deeper than ponds. That's why the answer is (D).

q: What are a major food source for other organisms, including humans?
Options:
- (A) Earthworms
- (B) Soft-bodied invertebrates
- (C) Fully cooking the oysters
- (D) absorb light energy
- (E) remains of prehistoric life
- (F) members of their own species
- (G) Humans
- (H) Lawns
a: (B)... Explanation: Mollusks are a major food source for other organisms, including humans. Mollusks are soft-bodied invertebrates. Soft-bodied invertebrates are a major food source for other organisms, including humans. That's why the answer is (B).

q: What do plants do during the day?
Options:
- (A) Exfoliation
- (B) amble
- (C) bite animals
- (D) produce light
- (E) grass
- (F) reproduce
- (G) sweating
- (H) respirate
a: (H)... Explanation: Plants release oxygen during the day but not during the night. Oxygen exchange is needed for plant respiration. Plant respiration occurs during the day but not during the night. That's why the answer is (H).

q: Playing is one way organisms that have ingestive metabolism learn how to what?
Options:
- (A) propagate
- (B) instinct
- (C) grow
- (D) nutrients
- (E) die
- (F) behave
- (G) survive
- (H) Grow well
a:
(F)... Explanation: Playing is one way mammals and other animals learn how to behave. Animals are organisms that have ingestive metabolism. Playing is one way organisms that have ingestive metabolism learn how to behave. That's why the answer is (F).