Fact 1: Earth 's magnetic patterns are used for finding locations by animals that migrate. Fact 2: Bird Migration and Isotopes Tracking animal migration is a difficult task. Given the two facts above, what uses Earth 's magnetic patterns to find locations?

OPTIONS:
- pigeons
- cats
- rats
- elephants
- Bats
- salmon
- birds
- humans

Answer: birds

Fact 1: Wind causes erosion. Fact 2: Erosion is the physical removal of rock particles. Given the two facts above, what causes the removal of rock particles?

OPTIONS:
- Warm air
- Sunlight
- heat
- stream
- rain
- Wind
- Time
- rivers

Answer: Wind

Fact 1: Creating wood-free paper does not require cutting down trees. Fact 2: Hemp paper is superior to wood paper. Given the two facts above, what doesn't hemp paper use?

OPTIONS:
- Acids
- RNA
- Water
- Trees
- Leaves
- Air
- heat
- fibers

Answer: Trees

Fact 1: Pollination is the fertilization step in the sexual reproduction of plants. Fact 2: Bees are absolutely essential for pollination. Given the two facts above, what step are bees essential in during the sexual reproduction of plants?

OPTIONS:
- pre-flowering
- death
- fertilization
- Energy.
- food and shelter
- hydration
- Animal survival
- survival

Answer:
fertilization