The gears on a bicycle are an example of what type of simple machine?

Lever

Wheel and Axle

Inclined plane

Pulley

The atomic nucleus made up from protons (yellow) and neutrons (blue) and held together by nuclear forces. nuclear forces (also known as nuclear interactions or strong forces) are the forces that act between two or more nucleons. they bind protons and neutrons (“nucleons”) into atomic

The answer is c - the principal of original lateral continuity. 

I’m not sure about this question