TASK DEFINITION: Given scientific fact as input, generate the question from this fact such that it can be answered from the input.
PROBLEM: In paragraph 2, they had been untouched for centuries does the phrase à¥ˆ€œfrozen in timeà¥ˆ€ suggest about the figures.

SOLUTION: In paragraph 2, what does the phrase à¥ˆ€œfrozen in timeà¥ˆ€ suggest about the figures?

PROBLEM: Molar masses can be used to determine the mass of a quantity of material.

SOLUTION: What can be used to determine the mass of a quantity of material?

PROBLEM: Transmembrane proteins span the entire plasma membrane.

SOLUTION:
What proteins span the entire plasma membrane?