Domains of life.
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   All living things are classified into 3 large domains.
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   Domains  Bacteria  and Archaea are unicellular prokaryotes and possess
   no nucleus.
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   Each of these two domains may comprise several kingdoms.
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   Domain Eukarya is split into 4 kingdoms of organisms with a nucleus.
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<Li> Protista contains both unicellular and multicellular organisms.
<Li> Plantae are multicellular, photosynthetic, terrestrial organisms.
<Li> Fungi are multicellular and digest food externally.
<Li> Animalia are multicellular and digest food internally.
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