Given scientific fact as input, generate the question from this fact such that it can be answered from the input.

Q: Sexually do invertebrates reproduce.

A: How do invertebrates reproduce?
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Q: Pyramid ecosystem is used to show energy flow through the trophic levels.

A: What is used to show energy flow through the trophic levels?
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Q: Passive transport occurs when substances cross the plasma membrane without any input of energy from the cell.

A:
What type of transport occurs when substances cross the plasma membrane without any input of energy from the cell?
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