Which simple machine is shown in the diagram?

a wedge
a screw
an inclined plane
a wheel and axle

Option (d) is the correct answer.

Explanation:

The given diagram shows that there is a wheel with handle at the left side so that the wheel can be rotated.

Also there is a rope attached to the center of wheel that can be pulled or pushed either in the upward or downward direction.

Thus, we can conclude that out of the given options, simple machine shown in the diagram is a wheel and axle.

1. a)c-14 has two more protons

2. d)they have different numbers of protons, neutrons, and valence electrons; they are all gases at room temperature.

3. c) iron and nickel.