instruction:
Given scientific fact as input, generate the question from this fact such that it can be answered from the input.
question:
A penguin must do increase muscle mass before molting.
answer:
A penguin must do what before molting?


question:
Vesicles are basic tools of the cell for organizing metabolism, transport, and storage of molecules.
answer:
What are basic tools of the cell for organizing metabolism, transport, and storage of molecules?


question:
Weight is the result of the force of gravity being opposed by the normal force.
answer:

What property is the result of the force of gravity being opposed by the normal force?