input with options: Fact 1: The gravitational pull of the Moon on Earth 's oceans causes the tides. Fact 2: Earth Day celebrations are now held across the world. Given the two facts above, what does gravitational pull of the moon cause?
OPTIONS:
- tides
- waves
- heat
- gravitational pull of the sun
- rain
- the world's orbit
- motion
- erosion
output: tides

Q: Fact 1: Male dogs use pheromones in urine to mark their territory. Fact 2: Pheromones are hormones that are thought to stimulate, through smell, sexual reactions in animals. Given the two facts above, what do male dogs use to mark their territory?

OPTIONS:
- smell
- H 2 O
- love
- intuition
- gourdin
- tongue
- sight
- fur

A: smell

input: OPTIONS:
- weather
- heat
- magma
- rain
- streams
- water
- trees
- crust Now, answer this question: Fact 1: The looseness of soil has a positive impact on a plant 's roots' growth in that soil. Fact 2: Tree roots stabilize the soil and prevent soil erosion. Given the two facts above, what makes soil stable?
A:
output: trees

Fact 1: The color of leaves on deciduous trees usually changes in the autumn season. Fact 2: Leaves change color, snow falls, and spring brings back the greenery. Given the two facts above, what season happens before snow falls, and spring brings back the greenery?

OPTIONS:
- autumn
- rainfall
- Winter
- H20
- spring
- rain
- middle
- summer

Answer: autumn

Problem: OPTIONS:
- chemical changes
- saves trees
- forms diamonds
- vaporization
- heating liquids
- kills trees
- weathering
- Pollution
Q: Fact 1: Gases from burning coal and oil dissolving in water in the atmosphere causes acid rain. Fact 2: Acid rain kills trees . Given the two facts above, what does gases from burning coal and oil dissolving in water in the atmosphere do?
Answer: kills trees

Fact 1: Lung cancer is most often caused by exposure to tobacco smoke. Fact 2: Tobacco is most commonly smoked in cigarettes. Given the two facts above, what is lung cancer most often caused by exposure to?

OPTIONS:
- Chemical energy
- carbon dioxide
- asbestos
- sunlight
- water
- fossil fuels
- cigarettes
- hydrocarbons

Answer:
cigarettes