TASK DEFINITION: Given scientific fact as input, generate the question from this fact such that it can be answered from the input.
PROBLEM: Six many neutrons do 99% of carbon atoms have.

SOLUTION: How many neutrons do 99% of carbon atoms have?

PROBLEM: An excellent solvent that holds heat well and allows hydrogen bonds, water substance has many properties critical to life.

SOLUTION: An excellent solvent that holds heat well and allows hydrogen bonds, what substance has many properties critical to life?

PROBLEM: Nuclear enevelope is a double membrane of the nucleus that encloses the genetic material.

SOLUTION:
What is a double membrane of the nucleus that encloses the genetic material?