Problem:OPTIONS:
- humans
- crop yeilds
- food safety
- health
- Cooking
- Animal survival
- recipe requirements
- farm production

Fact 1: Irradiating food can be used to kill existing microorganisms in the food. Fact 2: Food irradiation offers a solution for addressing the growing concerns associated with food safety. Given the two facts above, killing microorganisms in food is important to?
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A: food safety

Problem:OPTIONS:
- Proteins
- food
- DNA
- nutrients
- energy
- Light
- bamboo
- sunlight

Fact 1: Living things all require energy for survival. Fact 2: Energy is used for survival and reproduction. Given the two facts above, what do all living things require in order to reproduce?
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A: energy

Problem:OPTIONS:
- an exoskeleton
- legs
- Bodily water
- Damaged hearing
- kinetic energy
- a backbone
- Energy
- backs

Fact 1: Arthropods are the largest phylum of invertebrates. Fact 2: Invertebrates are animals without a backbone. Given the two facts above, what don't arthropods have?
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A: a backbone

Problem:OPTIONS:
- flooding
- Pesticides
- erosion
- contamination
- competition
- Pollution
- sulfur dioxide
- deforestation

Fact 1: Acid rain has a negative impact on water quality. Fact 2: Sulfur dioxide causes acid rain. Given the two facts above, water quality can be negatively effected by what? ?
****
A:
sulfur dioxide