The three types of waves that can be harmful to life are:
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Ultraviolet rays - Excessive exposure to UV rays can lead to skin cancer, cataracts, and other health issues.
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Gamma rays - These are highly energetic waves that can cause significant damage to living tissues and DNA, increasing the risk of cancer and other health problems.
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X-rays - While they are used in medical imaging, prolonged or excessive exposure to X-rays can also lead to cellular damage and increase cancer risk.
Infrared rays, microwaves, radio waves, and visible light are generally not harmful in typical exposure conditions.