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: The amniotic egg first evolved in reptiles.

Answer: The amniotic egg first evolved in what species?


Question: The pressure of a sample of gas is measured with an open-end manometer.

Answer: The pressure of a sample of gas is measured with an open-end what?


Question: You call a mixture of two or more substances in which dissolved particles are distributed evenly throughout a solution.

Answer:
What do you call a mixture of two or more substances in which dissolved particles are distributed evenly throughout?