A. a lever
Explanation:
To remove a nail from wood, a lever will be the best machine to use. In a lever, effort is applied to move a large load. The nail is treated as the load.
- Most hammers have nail removers that can be used to pull out nails.
- The force is applied at the handle.
- The head of the hammer has a fulcrum and nail remover part where the load is.
- This gives a large mechanical advantage and the nail can be pulled out.
- Wedge, wheel and axle and movable pulley are not machines that works as nail removers.
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The answer to this question would be Refract.......
The surface of the coolest star is Blue I believe.