If hammers cause debris, then what can cause debris? Answer choices: - wind - erosion - flooding - screwdriver - spoon - hammer - mines - fork
hammer

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
exercise

If agenerator uses fossil fuel, then what does a generator use? Answer choices: - acid - engines - air - cycles - A kernel - water - fossil fuel - to move people
fossil fuel