Trees have woody stems covered with what?
Options:
- (A) heat energy
- (B) thin skin
- (C) protective skin
- (D) skinny cells
- (E) white skin
- (F) Chlorophyll
- (G) Organic compounds
- (H) looseness
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Let's think first: Trees have woody stems covered with bark. On the outside is a protective skin of bark made mainly of cork. Trees have woody stems covered with protective skin.... So the answer is [(C)]

Viruses are so small that to see them a scientist would have to use what kind of lens?
Options:
- (A) Refract it
- (B) refraction of light
- (C) an electron lens
- (D) an image
- (E) rays or beams
- (F) bending light rays
- (G) A computer
- (H) flashlights
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Let's think first: Viruses are so small that they can be seen only with an electron microscope. On the surface of each microscopic color filter is also a microscopic lens. Viruses are so small that they can be seen only with an electron lens.... So the answer is [(C)]

What stimulates the reproductive system to form male organs in growth?
Options:
- (A) Chemical energy
- (B) barnacles
- (C) Electrical energy
- (D) a doorbell
- (E) sensory neurons
- (F) peachleaf willow
- (G) Veins and arteries.
- (H) male hormones
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Let's think first: Testosterone stimulates the reproductive organs to develop into male organs. Androgens are male hormones, like testosterone. Male hormones stimulated the reproductive organs to develop into male organs.... So the answer is [(H)]

What is the behavior of attracting something that is phenotypically similar to the seeker called?
Options:
- (A) an object
- (B) stalking
- (C) jealousy
- (D) nonverbal communication
- (E) ducks
- (F) animals
- (G) orchids
- (H) courtship
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Let's think first: Courtship is behavior that is intended to attract a mate. Assortative mating is the mating of individuals that are phenotypically similar. Courtship is the behavior of attracting something that is phenotypically similar to the seeker.... So the answer is [(H)]

What is able to make food using inorganic molecules?
Options:
- (A) trees
- (B) potatoes
- (C) ozone
- (D) organic fertilizer
- (E) bacteria
- (F) a plant
- (G) a consumer
- (H) fungi
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Let's think first: Producers make food from inorganic molecules. If the plant is green, it is a producer. Plants make food from inorganic molecules.... So the answer is [(F)]

Organisms that live in marine biomes must be adapted to what?
Options:
- (A) Deposition
- (B) fish
- (C) waves
- (D) darkness
- (E) salinity
- (F) heat or cold
- (G) evaporation
- (H) Deposition.
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Let's think first: Organisms that live in marine biomes must be adapted to the salt in the water. Salinity is the measure of salts in the water. Organisms that live in marine biomes must be adapted to salinity.... So the answer is [(E)]