Hydrogen bonds cause what to expand when it freezes?
Options:
- (A) salt
- (B) mercury
- (C) NaCl
- (D) lake
- (E) H20
- (F) rain
- (G) h2o
- (H) oxygen
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Let's think first: Hydrogen bonds cause water to expand when it freezes. Water is everywhere H20. Hydrogen bonds cause H20 to expand when it freezes.... So the answer is [(E)]

What is used as energy by most of the organisms on earth
Options:
- (A) sugar
- (B) heat
- (C) food
- (D) water
- (E) Light
- (F) Energy
- (G) salt
- (H) carbon
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Let's think first: Glucose is used for energy by the cells of most organisms. Blood Sugar Glucose is sugar. Sugar is used for energy by the cells of most organisms.... So the answer is [(A)]

Which living creatures can be found in wetlands?
Options:
- (A) Animals
- (B) ferns
- (C) ducks
- (D) Oceans
- (E) trees
- (F) Rivers
- (G) Lakes
- (H) crocodiles
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Let's think first: Wetlands are extremely important biomes. Animals live on the vegetation found in the biomes. Animals can be found to be living in wetlands.... So the answer is [(A)]

What can dna contain the instructions for?
Options:
- (A) keeps the organism warm
- (B) Something to move
- (C) Plant reproduction
- (D) a single protein
- (E) A computer
- (F) Animal survival
- (G) survival
- (H) an engine
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Let's think first: Most genes contain the instructions for a single protein. Genes are made of DNA, the substrate of hereditary information. DNA can contain the instructions for a single protein.... So the answer is [(D)]

Trees have woody stems covered with what?
Options:
- (A) food and shelter
- (B) smooth ridges
- (C) looseness
- (D) protective layer
- (E) Organic compounds
- (F) plastic sheet
- (G) heat energy
- (H) thin metal
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Let's think first: Trees have woody stems covered with bark. During the stripping, the protective layer of inner bark is removed. Trees have woody stems covered with a protective layer.... So the answer is [(D)]

What tells a cell what to do?
Options:
- (A) breathe
- (B) alleles
- (C) Energy
- (D) voltage
- (E) fever
- (F) genes
- (G) nerves
- (H) state
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Let's think first: Molecules of DNA are encoded with instructions that tell cells what to do. Genes are parts of DNA molecules. Genes are instructions that tell cells what to do.... So the answer is [(F)]