microbes

                                                    

Microbes were the first form of multicellular organisms on earth. Before the emergence
 of multicellular organisms, these were the only organisms on Earth for millions of 
years[62]. Microorganisms are normally single-celled organisms that are invisible to 
the eye and can only be seen with the help of a microscope. Some examples are bacteria,
 fungi, archaea, protists. Microorganisms are found everywhere on Earth.

Microorganisms abound wherever there is water, including indoors [63]. 
Their reproduction occurs quickly and abundantly. Linear mutation [64] and high 
mutation rates combine to make microbes highly adaptable organisms.
 Thus they survive in new environments including space [65]. They form essential
 organisms for the Earth's ecosystem.

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