Answer:
Light
Explanation:
Plant is a thing so it has matter
Cheese is food so it has matter
Blood is a liquid so it has matter
Answer:
<em>The electrons in an atom can only occupy certain allowed energy levels to a lower one</em>, the excess energy is emitted as a photon of light, with its wavelength dependent on the change in electron energy. This is why an atom can only emit specific wavelengths of light and not every possible wavelength.
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