Answer:
D...lighting a match
Explanation:
because you cannot get back the original match back
Answer: Valves in the veins
Explanation: The flow of the blood inside the body takes place through the veins and arteries. The oxygenated blood from the heart is supplied to the different parts of the body.
The blood flows from the capillaries to the venules and from there to the veins. The blood moves in the veins by the rhythmic movement of the smooth muscles in the body.
Most of the blood moves against the gravity so there is a chance that it can backflow so to prevent this there are valves in the veins known as one way valves.
Depending on what electromagnetism your talking of,
visible electromagnetism in which eyes detect things like Fireflies, light bulbs, and stars all emit visible light.
<span>radio waves emitted by radio stations. Radio waves are also emitted by </span>stars<span> and gases in space.
</span>Infrared - is like the vision that night googles that<span> pick up the light emitted by things with heat.
</span>
https://imagine.gsfc.nasa.gov/science/toolbox/emspectrum1.html
