<span>The symptoms of xeroderma pigmentosum, or XP, usually appear in infancy. They can range from extreme sunburn after a few minutes of exposure to UV rays, to the reddening of the white of the eyes if no sun protection is worn. Most patients with XP develop skin or eye cancer multiple times in their lifetime. Around half of the children diagnosed with XP will develop skin cancer by their 10th birthday.</span>
The enter through the Cell Membrane
<span>Soil creation is an outcome of successions that are carried out. Succession involves a sequence of stages which includes climax stage. It can be primary or secondary too. On the primary succession, colonization of habitats is involved. Reestablishment of a community occurs on the secondary succession. Most of the organisms and other organic components have been ruined.</span>
I don't know if you mean, what should viruses have to be living, if it's so :
They must be cellular, meaning they should have a cytoplasm a cell membrane and some organelles (at least ribosome).
But if you mean to say what in common they have with livings:
I can say that they have DNA, thats common both with viruses and livings.
