One example of an annelid has how many hearts?
Options:
- (A) three
- (B) Five
- (C) white
- (D) warm
- (E) four
- (F) strong
- (G) long
- (H) small
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Let's think first: Annelids are worms such as the familiar earthworm. An earthworm has five hearts. An animal that has five hearts is an annelid.... So the answer is [(B)]

Organisms cluster around hot water inside cracks where?
Options:
- (A) loose soil
- (B) ocean floor
- (C) food and shelter
- (D) tectonic plates
- (E) the ground
- (F) allow growth
- (G) Absorb light
- (H) survive
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Let's think first: Organisms cluster around hydrothermal vents in the ocean floor. Background Hot water vents form inside cracks in the ocean floor. Organisms cluster around hot water inside cracks in the ocean floor.... So the answer is [(B)]

Adult sponges are
Options:
- (A) warm
- (B) immobile
- (C) food
- (D) parasites
- (E) strong
- (F) white
- (G) fertile
- (H) warm-blooded
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Let's think first: Adult sponges are sessile. Sessile Attached permanently, immobile. Adult sponges are attached permanently, immobile.... So the answer is [(B)]