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

[Q]: The long, threadlike extensions of the nerve cell help transmit nerve impulses.
[A]: Which part of the nerve cell helps transmit nerve impulses?


[Q]: Molar masses can be used to determine the mass of a quantity of material.
[A]: What can be used to determine the mass of a quantity of material?


[Q]: Within the petals are two whorls of fertile floral organs that produce spores.
[A]:
Within the petals are two whorls of fertile floral organs that produce what?