Random question?

David planted ten corn seeds in sandy soil and ten corn seeds in clay soil. He kept both groups of plants at room temperature, gave them the same amount of water, and placed them all in the same sunny room. Which of the following questions is David most able to answer with his experiment?

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Question generated: Which situation is an example of a feedback system in the body that maintains homeostasis?

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

Answer: The body maintains equilibrium through a series of messages called a feedback mechanism. What organ releases hormones that maintain balanced glucose levels?

question: Write a question you would see in a school textbook. OPTIONS:
- an exothermic reaction that absorbs energy
- an exothermic reaction that releases energy
- an endothermic reaction that absorbs energy
- an endothermic reaction that releases energy
answer: When sodium hydroxide reacts with a copper nitrate solution, the reaction vessel needs to be kept on ice to slow down the reaction. What best describes this reaction?

An example of a grad-school level question?
When an atom has a neutral charge, which particles within the atom have equal numbers?

Random question?
Which features are physical properties of an iron nail?