Q: At least 20 percent of the world's people do not have a ready supply of what? Choices: - clothing - food - oil - clean drinking water A:
clean drinking water

Q: Statoliths are starch-filled plastids that enable plant roots to detect what force? Choices: - variation - impact - current - gravity A:
gravity

Q: What source of water pollution picks up chemicals from the ground with water and carries them to bodies of water? Choices: - fertilizer - erosion - sediment - runoff A:
runoff