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: During the first year after birth, a baby called a(n) infant.

Answer: During the first year after birth, what is a baby called?


Question: Seismologists originally measured the intensity of an earthquake with the mercalli scale.

Answer: How did seismologists originally measure the intensity of an earthquake?


Question: Single-celled are yeasts.

Answer:
What kind of organisms are yeasts?