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Things that are borderline between living and non-living things, usually because they are arguably too small to be living; or organisms (mostly very tiny Bacteria or Archaea) believed to be the smallest, or nearly the smallest, living things possible.
This category has the following 3 subcategories, out of 3 total.
The following 20 pages are in this category, out of 20 total. This list may not reflect recent changes (learn more).