*Question*
If releasing carbon into the atmosphere has a negative impact on an ecosystem, then releasing what can have a negative impact on an ecosystem? Answer choices: - disease - viruses - A virus - Carbon - tar - toxins - herbicide - vehicles
**Answer**
Carbon

*Question*
If the amount of daylight is caused by the tilt of the earth's axis, then what determines the amount of daylight earth gets? Answer choices: - 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
**Answer**
The tilt of the axis

*Question*
If exercise can teach animals how to behave, then what can teach animals how to behave? Answer choices: - adding heat - humans - fossil fuels - A computer - nerves - people - irradiation - exercise
**Answer**
exercise

*Question*
If speciation occurs in response to a change in the environment, then what occurs in response to a change in the environment? Answer choices: - adding heat - fossil fuels - agriculture - Animal survival - movement - root growth - speciation - relocation
**Answer**
speciation