If hormones affect cell aging, then what affects cell aging? Answer choices: - hormones - radiation - Smoking - fat - acid - temperature - cigarettes - weather
hormones

If motion causes thermal expansion, then what causes thermal expansion? Answer choices: - power - Chimneys - Sun - motion - Energy. - sunlight - coal - energy
motion

If ethanol is used to produce electricity by burning, then what is used to produce electricity by burning? Answer choices: - air - heat - energy - cells - calcite - hydrogen - fire - ethanol
ethanol