Question

Are nonpolar covalent bonds uncommon?

Answer 1

Well, no

Explanation:

To a first approximation, all matter in the universe is hydrogen or helium. Helium does not form covalent bonds, but a hydrogen atom can certainly bind to another hydrogen to form a non-polar covalent bond.

Back here on Earth, both `C-H` and `C-C` bonds are non-polar, and these bonds pervade biology.