input: OPTIONS:
- heat is produced
- a tree falling
- peachleaf willow
- Plant growth is reduced
- root growth
- mechanical weathering
- Condensation
- fissures of hot, acidic water Now, answer this question: Fact 1: Cycles of freezing and thawing water cause ice wedging. Fact 2: Ice wedging is the most important form of mechanical weathering. Given the two facts above, what is caused by cycles of water freezing and thawing?
A:
output: mechanical weathering

Fact 1: Phytoplankton are bacteria and algae that use sunlight to make food. Fact 2: Most copepods feed on phytoplankton. Given the two facts above, what happens to bacteria and algae that use sunlight to make food?

OPTIONS:
- Transfers energy
- food poisoning
- production of energy
- they form a bomb
- it helps plants in growing
- they die
- copepods feed on them
- competing for resources

Answer: copepods feed on them

Problem: OPTIONS:
- neutralized water
- where they used to live
- hot alkaline water
- fissures of hot, acidic water
- sedimentary rocks
- fissures blasting cold water
- at or near the margins
- an area swollen with pus
Q: Fact 1: Organisms cluster around hydrothermal vents in the ocean floor. Fact 2: Hydrothermal vents are fissures in the ocean floor that leak hot, acidic water. Given the two facts above, where do organisms cluster on the ocean floor?
Answer: fissures of hot, acidic water

Problem:OPTIONS:
- Pollution
- sun's heat
- gravity
- moon
- competition
- darkness
- temperature
- tides

Fact 1: Plants detect and respond to the daily cycle of light and darkness. Fact 2: Plants are sensitive to light. Given the two facts above, what are plants sensitive to?
****
A: darkness

Fact 1: Plant reproduction requires pollination. Fact 2: Perennial types are planted outside in spring. Given the two facts above, what reproduction requires pollination?
OPTIONS:
- humans
- They lay eggs
- Tropical
- bees
- insects
- subtropical
- perennials
- heterotrophs
perennials

Fact 1: Air pollution can cause the pH of soil to decrease. Fact 2: Highly acid soil is detrimental to crop growth and biological activity in soil. Given the two facts above, crop growth can be negatively impacted by?
OPTIONS:
- fossil fuels
- light pollution
- Pollution
- drought
- rainbow falls
- Greenhouse gasses
- lunar eclipse
- air pollution

Answer:
air pollution