What forms in shallow tropical water?
Options:
- (A) ocean
- (B) romance
- (C) bushes
- (D) ferns
- (E) reefs
- (F) bamboo
- (G) fossils
- (H) snorkelling
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Let's think first: Corals form large colonies in shallow tropical water. Huge colonies of hard corals form coral reefs . Reefs form in shallow tropical water.... So the answer is [(E)]

What are mollusks used for?
Options:
- (A) a herbivore diet
- (B) survival
- (C) a vegetarian diet
- (D) Converting waste.
- (E) Catch prey
- (F) an omnivore diet
- (G) an egg diet
- (H) animal transport
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Let's think first: Mollusks are a major food source for other organisms, including humans. Many organisms are omnivores with variable diets. Humans have variable diets and some consume mollusks as a major food source.... So the answer is [(F)]

Muscle and internal organs are protected by:
Options:
- (A) immunization
- (B) fur
- (C) fat
- (D) bone
- (E) hair
- (F) skin
- (G) defense
- (H) copper
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Let's think first: Bone provides protection for soft tissues and internal organs. Soft tissue refers to the soft connective or supporting tissues, such as muscle. Bone provides protection for muscles and internal organs.... So the answer is [(D)]

What increases the productivity and stability of the entire global system?
Options:
- (A) important habitats
- (B) Plants growth
- (C) solar system
- (D) animals
- (E) biodiversity
- (F) environment
- (G) bottlenecks
- (H) power stations
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Let's think first: Biodiversity increases the productivity and stability of ecosystems. Marine ecosystems also act as stabilizers of global systems especially our climate. Biodiversity increases the productivity and stability of the entire global system.... So the answer is [(E)]

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
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Let's think first: 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.... So the answer is [(B)]

What can happen when menstruation stops occurring?
Options:
- (A) Localized damage
- (B) Dehydration
- (C) periods
- (D) diabetes
- (E) massive damage
- (F) hot flashes
- (G) Sulfur dioxide
- (H) epilepsy
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Let's think first: Menopause occurs when menstruation stops occurring, usually in middle adulthood. Hot flashes are the classic sign of menopause and peri-menopause. Hot flashes can occur when menstruation stops occurring.... So the answer is [(F)]