Temperature and pressure receptors in most animals are located:
Options:
- (A) Veins and arteries.
- (B) in one limb each
- (C) in the same organ
- (D) an organism's body
- (E) it keeps an organism warm
- (F) in two different organs
- (G) in plants
- (H) frontal zones
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Let's think first: Pressure receptors are found mainly in the skin. Temperature sensors in vertebrates are located in the skin and in the hypothalamus. Temperature and pressure sensors are located in the same organ in most animals.... So the answer is [(C)]

What comes from reproduction?
Options:
- (A) babies
- (B) protein
- (C) pollution
- (D) dead cells
- (E) Energy
- (F) seeds
- (G) Most plants
- (H) children
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Let's think first: Reproduction is the process by which living things give rise to offspring. Most people want to have children who are the biological offspring of both parents. Reproduction is the process by which living things produce children.... So the answer is [(H)]

What fiber can be found only in warm-blooded animals?
Options:
- (A) teeth
- (B) birth marks
- (C) muscle
- (D) taste buds
- (E) hair
- (F) wool
- (G) sugar
- (H) fur
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Let's think first: Hair is a fiber that is found only in mammals. All mammals are warm-blooded. Hair is a fiber that is found only in warm-blooded animals.... So the answer is [(E)]

What do plants respond to?
Options:
- (A) Chemical energy
- (B) Vibrations
- (C) heat energy
- (D) Sulfur dioxide
- (E) Temperature
- (F) sun's heat
- (G) Clouds
- (H) Wood
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Let's think first: Plants respond to daily and seasonal cycles and to disease. Temperature follows a seasonal cycle. Plants respond to temperature.... So the answer is [(E)]

Migration increases what?
Options:
- (A) root growth
- (B) speed
- (C) distance
- (D) voltage
- (E) energy usage
- (F) Plants growth
- (G) gene flow
- (H) layers of fat
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Let's think first: Gene flow occurs when individuals move into or out of a population. Internal migration describes moves within a country. Gene flow occurs when individuals migrate.... So the answer is [(G)]

What is the reason beak variation came about in birds?
Options:
- (A) By wind and rain
- (B) Attracting mates
- (C) It helps them survive
- (D) the Earth being tilted
- (E) Competing species evolving
- (F) it keeps an organism warm
- (G) To assist in flying
- (H) Warding off predators
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Let's think first: Specialization occurs when competing species evolve different adaptations. Beaks show a lot of variation and specialization for different functions. Beak variation came about because of competing species evolving different adaptations.... So the answer is [(E)]