Correct Answer: D
Explanation:
(D) A windmill is a simple machine that generates energy when it is moved by the breeze; a water wheel is a simple machine that generates energy when it is moved by a current (of water).
WINDMILL: anything like a windmill, as a
propellerlike toy (pinwheel) revolved by
wind
Pinwheel: a small wheel with variously colored
vanes of paper, etc., pinned to a stick so
as to revolve in the wind
Rotation: a) a turning or spinning motion of a body around a center or axis; rotation b) one complete turn of such a rotating body
Pump: any of various machines that force a liquid or
gas into or through, or draw it out of,
something, as by suction or pressure
Dynamo: a forceful, dynamic person
Water wheel: a wheel turned by water running against or falling on paddles, used as a source of power
Plow: a farm implement used to cut, turn up, and
break up the soil