What are killer whales?
Options:
- (A) red and black
- (B) They have thick fur
- (C) dangerous
- (D) sharks
- (E) deep sea creatures
- (F) marine species
- (G) Absorb light
- (H) animals
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Let's think first: Marine species live mainly in shallow coastal waters. Killer whales prefer shallow and colder coastal waters. Killer whales are a marine species.... So the answer is [(F)]

Mammals find breath through the action of what thing beneath their lungs?
Options:
- (A) matter
- (B) the skin
- (C) muscle
- (D) organ
- (E) lmestone
- (F) oxygen
- (G) gas
- (H) Epidermis
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Let's think first: Mammals breathe with the help of a diaphragm. Hiccups are caused by involuntary spasms of the diaphragm, the muscle beneath the lungs. Mammals breathe with the help of a muscle below the lungs.... So the answer is [(C)]

Something specialized to detect a stimulus is found mainly where?
Options:
- (A) fields
- (B) humans
- (C) bushes
- (D) bats
- (E) a path
- (F) skin
- (G) retina
- (H) Birds
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Let's think first: Pressure receptors are found mainly in the skin. Sensory Receptors A receptor is any structure specialized to detect a stimulus. Something specialized to detect a stimulus is found mainly in the skin.... So the answer is [(F)]

What organism uses their sense of smell to find a mate?
Options:
- (A) fur seals
- (B) bears
- (C) Amphibians
- (D) Fish
- (E) mammals
- (F) Butterflies
- (G) rabbit
- (H) Honey smelling bees
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Let's think first: Most salamanders use their sense of smell to find a mate. Salamanders are a type of amphibian. Some amphibians use their sense of smell to find a mate.... So the answer is [(C)]

What does pollen consist of tiny grains of?
Options:
- (A) it helps plants in growing
- (B) the female sexual organs
- (C) Something with exactly eight protons
- (D) seeds
- (E) Microscopic organisms
- (F) the male sex cells of plants
- (G) bees
- (H) sub-units of species
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Let's think first: Pollen consists of tiny grains that are the male gametes of plants. Animals that reproduce sexually produce sex cells, or gametes. Pollen consists of tiny grains that are the male sex cells of plants.... So the answer is [(F)]

Cells cannot live without what commonly occuring element found on earth?
Options:
- (A) Air
- (B) matter
- (C) Light
- (D) fossil fuel
- (E) oxygen
- (F) carbon
- (G) sunlight
- (H) water
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Let's think first: Cells cannot survive without oxygen. Survival is to live, to live means hope. Cells cannot live without oxygen.... So the answer is [(E)]