<span>Mercury, Venus, and Mars. It depends a bit on where you measure the gravity. </span><span>
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<span>Causes Of Melanoma. Ultraviolet rays Most skin cancers are caused by too much exposure to the sun's ultraviolet (UV) rays. The two types of UV rays that cause melanoma are UV-A and UV-B rays.</span>
Answer:
D. X is eukaryotic and Y is prokaryotic