input with options: Fact 1: Cutting down trees has a negative impact on an ecosystem. Fact 2: If trees are cut or burned, the carbon is released back into the atmosphere. Given the two facts above, releasing what can have a negative impact on an ecosystem?
OPTIONS:
- disease
- viruses
- A virus
- Carbon
- tar
- toxins
- herbicide
- vehicles
output: Carbon

input with options: Fact 1: When the seasons change from the summer to the fall , the amount of daylight will decrease. Fact 2: Seasons are caused by the tilt of the earth's axis. Given the two facts above, what determines the amount of daylight earth gets? ?
OPTIONS:
- Heat energy
- The darkness it gets
- The bending of a ray of light
- The tilt of the axis
- The tilt of the sun's axis
- electromagnetic energy
- The brightness of the earth
- rain or sun shine
output: The tilt of the axis

input with options: Fact 1: Playing is one way mammals and other animals learn how to behave. Fact 2: Exercise is fun if it is also play. Given the two facts above, what can teach animals how to behave?
OPTIONS:
- adding heat
- humans
- fossil fuels
- A computer
- nerves
- people
- irradiation
- exercise
output: exercise

input with options: Fact 1: Evolution occurs in response to a change in the environment. Fact 2: Speciation is an extension of evolution. Given the two facts above, what occurs in response to a change in the environment?
OPTIONS:
- adding heat
- fossil fuels
- agriculture
- Animal survival
- movement
- root growth
- speciation
- relocation
output:
speciation