q: What are bird beaks often adapted to eat?
Options:
- (A) moles.
- (B) fish
- (C) nests
- (D) chicks
- (E) trees
- (F) apples
- (G) edible
- (H) Fruits
a: (B)... Explanation: Bird beaks are generally adapted for the food they eat. Birds eat the fish, algae and human food. Bird beaks are often adapted for eating fish. That's why the answer is (B).

q: What do plants build their cell walls from?
Options:
- (A) By wind and rain
- (B) Deposition
- (C) Deposition.
- (D) algae
- (E) Chemical energy
- (F) plant wall
- (G) plant material
- (H) polysaccharides
a: (H)... Explanation: Plants use cellulose for their cell walls. Another important polysaccharide is cellulose. Plants use a polysaccharide for their cell walls. That's why the answer is (H).

q: What kicks in after a certain number of divisions?
Options:
- (A) Energy.
- (B) antibiotics
- (C) Energy
- (D) separation
- (E) nerves
- (F) apoptosis
- (G) soccer leagues
- (H) Plants growth
a: (F)... Explanation: Cells are programmed to divide only a set number of times. Apoptosis is programed cell death. Division can only happen a certain number of times before apoptosis kicks in. That's why the answer is (F).

q: What has a relatively complex circulatory system with a three-chambered heart?
Options:
- (A) frogs
- (B) a fish
- (C) salmon
- (D) alpacas
- (E) Man
- (F) Birds
- (G) sharks
- (H) pan
a:
(A)... Explanation: Amphibians have a relatively complex circulatory system with a three-chambered heart. All frogs are amphibians. Frogs have a relatively complex circulatory system with a three-chambered heart. That's why the answer is (A).