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

[Q]: Like skeletal muscle, cardiac muscle is striated.
[A]: Like skeletal muscle, cardiac muscle is what?


[Q]: Over 90% of the energy we use comes originally from the sun.
[A]: Over 90% of the energy we use comes originally from what?


[Q]: Four electron groups orient themselves into tetrahedron shape that has four faces.
[A]:
Four electron groups orient themselves into what shape that has four faces?