Ozone depletion results in radiation levels that are highest when?
Options:
- (A) middle of the day
- (B) forest is destroyed
- (C) late evening
- (D) Under 32 degrees
- (E) middle of the night
- (F) Temperature changing
- (G) Plant growth is reduced
- (H) early morning
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Let's think first: Ozone depletion results in higher levels of UV radiation reaching Earth. Solar UV radiation levels are highest during the middle of the day. Ozone depletion results in radiation levels that are highest during the middle of the day.... So the answer is [(A)]

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)]

Hermatypic organisms provide what to many ocean organisms?
Options:
- (A) survival
- (B) food and shelter
- (C) competition
- (D) kinetic energy
- (E) produce light
- (F) important habitats
- (G) protect them
- (H) major threat to health
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Let's think first: Coral reefs provide food and shelter to many ocean organisms. Reef-building corals are hermatypic. Hermatypic organisms provide food and shelter to many ocean organisms.... So the answer is [(B)]

What do cells secrete to maintain the proper ph for enzymes to work?
Options:
- (A) Energy
- (B) Chemical energy
- (C) water conservation
- (D) sweating
- (E) heat energy
- (F) aqueous solution
- (G) Organic compounds
- (H) electrolytes
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Let's think first: Cells secrete acids and bases to maintain the proper pH for enzymes to work. Acids and bases are electrolytes. Cells secrete electrolytes to maintain the proper pH for enzymes to work.... So the answer is [(H)]

What does taking off one's clothing improve the efficacy of?
Options:
- (A) recovery
- (B) hydration
- (C) Sweating
- (D) Modesty
- (E) Waterproofing
- (F) Exfoliation
- (G) Honesty
- (H) staying warm
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Let's think first: Sweating reduces body heat. Clothing reduces the effectiveness of sweating as a means of cooling the body. Clothing can have an impact on the effectiveness of sweating to cool the body.... So the answer is [(C)]

What do echinoderms lack?
Options:
- (A) Lungs
- (B) Mass
- (C) oxygen
- (D) eardrum
- (E) gills
- (F) ovaries
- (G) Organs
- (H) Bodies
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Let's think first: Echinoderms lack respiratory and excretory systems. Lung mechanics and gas exchange are topics during study of the respiratory system. Echinoderms have no lungs.... So the answer is [(A)]