Given scientific fact as input, generate the question from this fact such that it can be answered from the input.
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Question: Some meteorites are made of iron and nickel and are thought to be very similar to the core of the earth.

Answer: Some meteorites are made of iron and nickel and are thought to be very similar to what part of the earth?


Question: The combustion of propane gas produces carbon dioxide and water vapor.

Answer: The combustion of propane gas produces carbon dioxide and what else?


Question: The body contains three types of muscle tissue.

Answer:
The body contains how many types of muscle tissue?