Biology, 28.07.2019 14:10 kobiemajak

The first organisms on earth appeared approximately 3.5 billion years ago and were all unicellular. multicellular organisms have only existed for about one billion years. what evolutionary milestone made it possible for more complex, multicellular organisms to exist? appearance of heterotrophic cells appearance of autotrophic cells appearance of stem cells appearance of eukaryotic cells

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