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)]

Vertebrates are animals that have what?
Options:
- (A) major threat to health
- (B) the digestive system
- (C) characteristics
- (D) a three chambered heart
- (E) moving bones and joints
- (F) scales on their skin
- (G) a vertebrate column
- (H) aerobic capacity
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Let's think first: Vertebrates are animals that have a backbone. All vertebrates have a backbone or vertebral column. Vertebrates are animals that have a vertebral column.... So the answer is [(G)]

What occurs when gametes fuse to form a diploid zygote?
Options:
- (A) permineralization
- (B) rapid expansion
- (C) competition
- (D) fertilization
- (E) photosynthesis
- (F) chromosomes
- (G) mutation
- (H) Leptospirosis
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Let's think first: Fertilization occurs when a sperm and an egg fuse to form a diploid zygote. Sperm and eggs are cells known as gametes. Fertilization occurs when gametes fuse to form a diploid zygote.... So the answer is [(D)]