Gold is a natural resource, because it occurs naturally in the environment and humans use it. Gold cannot be made from other substances, and there is a finite supply of it. What is gold an example of?

A. a fossil fuel
B. a renewable resource
C. a nonrenewable resource
D. a natural pollut

What type of interaction occurs between the r groups of valine and isoleucine in a tertiary structure? view available hint(s) what type of interaction occurs between the r groups of valine and isoleucine in a tertiary structure? salt bridge disulfide bridge hydrogen bond hydrophobic interaction