Random question?

Cancer is best described as

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Question generated: A recent study concluded that about 90% of all large predatory fish such as tuna have disappeared from the world's oceans in the past 50 years. Which of these is most likely the direct cause of this loss?

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

Answer: An element with which property would be best to use in electrical wiring?

question: Write a question you would see in a school textbook. OPTIONS:
- air
- soil
- water
- sunlight
answer: If a tall tree falls over in a crowded forest, which resource becomes available to the surrounding plants?

An example of a grad-school level question?
Which human organ system produces sperm or egg cells?

Random question?
Humans cannot survive without clean, fresh water. Reservoirs of liquid water vary, but all water spends time as a gas in the atmosphere. What is the source of most of the water in the atmosphere?