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

Over 90% of the energy we use comes originally from the sun.
Over 90% of the energy we use comes originally from what?

Rubber is an example of a(n) insulators that does not allow electrons to move through them.
Rubber is an example of what type of substances that do not allow electrons to move through them?

All types of cells are enclosed by a membrane.

All types of cells are enclosed by what?