Problem:OPTIONS:
- Electrical energy
- electricity
- electron microscope
- density
- light bulbs
- rays or beams
- sounds
- hydrogen and oxygen

Fact 1: Alaser is used for producing light. Fact 2: Light seems to travel in rays or beams. Given the two facts above, what is a laser used for producing?
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A: rays or beams

Problem:OPTIONS:
- A transportation fuel
- extremely important
- a hemisphere is tilted away from the sun
- series of enzyme-mediated reactions
- production of energy
- the most widely used biofuel
- chemical messengers
- it helps plants in growing

Fact 1: Cellular respiration is when a cell converts from oxygen and carbohydrates into carbon dioxide, water, and energy. Fact 2: Cellular respiration involves a series of enzyme-mediated reactions. Given the two facts above, what is it when a cell converts from oxygen and carbohydrates into carbon dioxide, water, and energy?
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A: series of enzyme-mediated reactions

Problem:OPTIONS:
- layers of fat
- Veins and arteries.
- sweating
- matter vibrating
- blood vessels
- the skin
- Chemical energy
- sensory neurons

Fact 1: Dilation occurs when cell walls relax. Fact 2: An aneurysm is a dilation of a blood vessel. Given the two facts above, what relaxes, thereby causing aneurysms?
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A: blood vessels

Problem:OPTIONS:
- evaporation
- barrel-shaped
- motility
- Heart rate
- squeeze
- breathing
- hormones
- survival

Fact 1: Breathing is when a gill converts from oxygen in water into oxygen in blood. Fact 2: All fish have gills . Given the two facts above, when fish convert oxygen in water to oxygen in blood this is called?
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A:
breathing