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The ratio of an object's mass to its volume is its

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Question generated: Which two activities use most of the water used in an average U.S. household?

Problem: Write a question you would see in a school textbook.

Answer: What chemical symbol represents the element iron?

question: Write a question you would see in a school textbook. OPTIONS:
- recycling aluminum cans
- cutting down trees in forests
- mining minerals such as gold
- conserving freshwater resources
answer: Which of the following could limit the supply of a renewable resource?

An example of a grad-school level question?
When a multicellular organism is damaged, it will repair itself as

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Plants on hills keep dirt in place during a rain storm. Plant roots grow into the dirt and keep the dirt from moving. Why do roots grow into the dirt?