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.
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https://imagine.gsfc.nasa.gov/science/toolbox/emspectrum1.html
Answer: B
Explanation: Common Sense
It can be from how they are feeling the germs keep building up