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

[EX Q]: Most have cells that are not able to exchange gases with the outside environment do multicellular organisms need transport systems.
[EX A]: Why do multicellular organisms need transport systems?

[EX Q]: Although they differ vastly in hardness, pencil lead and diamonds both contain carbon.
[EX A]: Although they differ vastly in hardness, pencil lead and diamonds both contain what element?

[EX Q]: Vagus nerve nerve directly stimulates the contraction of skeletal muscles in the pharynx and larynx to contribute to the swallowing and speech functions.
[EX A]:
Which nerve directly stimulates the contraction of skeletal muscles in the pharynx and larynx to contribute to the swallowing and speech functions?