If tar causes damage to the lungs, then what causes damage to the lungs? Answer choices: - breathing - tar - HPV - fire - CFCs - sunshine - coal - mist
tar

If spikes come from tidal energy, then what are used to produce current? Answer choices: - tube - waves - coal - streams - copper - rivers - engines - fibers
waves

If green plants grow best outside, then where do green plants grow best? Answer choices: - dark corners - soils - outside - on Mars - mild - indoors - loose soil - Light
outside

If corn is important to Iowa, then what is the most important product in Iowa? Answer choices: - Nebraska - Des Moines - Windmills - sugar - copper - food - Corn - paper
Corn