Problem:OPTIONS:
- Plant growth is reduced
- make food glow
- make food unsafe
- harm consumers
- depress neuronal excitability
- extend the shelf life of food
- major threat to health
- prevent heat loss

Fact 1: Killing microorganisms in food can be used to extend the shelf life of that food. Fact 2: Irradiation kills microorganisms that spoil food. Given the two facts above, what can irradiation do?
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A: extend the shelf life of food

Problem:OPTIONS:
- decrease stamina
- comfort them
- inspire them
- quiet them
- kill them
- to move people
- startle them
- Movement

Fact 1: Loud noises can cause animals to startle. Fact 2: All mammals are animals. Given the two facts above, what does loud noises often do to mammals?
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A: startle them

Problem:OPTIONS:
- moss
- hitting it with a hammer
- steady temperature
- bad music
- copper
- iron
- sodium
- coal

Fact 1: Moss causes chemical weathering. Fact 2: Chemical weathering causes chemical changes in the minerals of a rock. Given the two facts above, what causes chemical changes in the minerals of a rock?
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A: moss

Problem:OPTIONS:
- stomach
- evaporation
- support structures
- at or near the margins
- reservoir
- watershed
- near the shoreline
- lake

Fact 1: Astem is used to store water by some plants. Fact 2: Stems Stems are the support structures of a plant. Given the two facts above, where is water sometimes stored in a tree or plant?
****
A:
support structures