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)]

What helps to insulate and protect the body?
Options:
- (A) tail fins
- (B) Animal fur
- (C) fur seals
- (D) keratin
- (E) nitrogen
- (F) snow
- (G) Epidermis
- (H) poultry
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Let's think first: Hair helps to insulate and protect the body. Hair is composed of the protein keratin. The protein keratin helps to insulate and protect the body.... So the answer is [(D)]

What is used as energy by most organisms?
Options:
- (A) sodium
- (B) water
- (C) energy.
- (D) food
- (E) sugar
- (F) Energy
- (G) solutes
- (H) light
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Let's think first: Glucose is used for energy by the cells of most organisms. For instance, glucose is a sugar. Sugar is used for energy by the cells of most organisms.... So the answer is [(E)]

What does vision give you?
Options:
- (A) ability to eat
- (B) characteristics
- (C) ability to taste
- (D) ability to sense light
- (E) ability to sense sound
- (F) It gets more light
- (G) Something that is self-aware
- (H) Your sensory system picks it up
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Let's think first: Sight is the ability to sense light, and the eye is the organ that senses light. Vision begins with sight. Vision is the ability to sense light and the eye is the organ that senses light.... So the answer is [(D)]

What occurs when a male gamete swims to an egg?
Options:
- (A) permineralization
- (B) competition
- (C) movement
- (D) rapid expansion
- (E) fertilization
- (F) birth
- (G) copulation
- (H) ovulation
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Let's think first: Fertilization occurs when sperm swim to an egg inside an archegonium. Gametes in males are called sperm, and in women commonly referred to as eggs. Fertilization occurs when male gametes swim to an egg.... So the answer is [(E)]

What is a major food source for humans?
Options:
- (A) poison dart frogs
- (B) honeybees
- (C) barnacles
- (D) intervertebrates
- (E) other humans
- (F) photosynthesis
- (G) the body's largest organ
- (H) Most plants
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Let's think first: Mollusks are a major food source for other organisms, including humans. Mollusks are invertebrates and are no exception. Intervertebrates are a major food source for other organisms, including humans.... So the answer is [(D)]