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Plants and fungi did not appear until roughly 500 million years ago. They were soon followed by arthropods (insects and spiders). Next came the amphibians about 300 million years ago, followed by mammals around 200 million years ago and birds around 150 million years ago.
The earliest clear evidence of life comes from biogenic carbon signatures and stromatolite fossils discovered in 3.7 billion-year-old metasedimentary rocks from western Greenland. In 2015, possible remains of biotic life were found in 4.1 billion-year-old rocks in Western Australia.
Life first evolved as single-celled organisms in the Archean era, then as eukaryotic-celled life in the Proterozoic era. Then in the Paleozoic, the Mesozoic, and the Cenozoic eras, which are all marked by mass extinction events, multicellular life flourished and evolved.
Characteristics of earliest life forms. small (1-2 nanometers) single-celled. no external appendages. little internal structure. no nucleus. resembled today s bacteria. in group called prokaryotes (before nucleus)
Prokaryotes were the first form of life to appear on the earth. Prokaryote are unicellular organisms that lack a well defined nucleus, mitochondria, or any other membrane-bound organelle.
Did you know that life on Earth began in the oceans? First came true bacteria and probably archaea, followed by eukaryotes. Eukaryotes include protists, plants, animals, and fungi. Protists appeared first.
Prokaryotes were the earliest life forms, simple creatures that fed on carbon compounds that were accumulating in Earths early oceans. Slowly, other organisms evolved that used the Suns energy, along with compounds such as sulfides, to generate their own energy.
The earliest life forms we know of were microscopic organisms (microbes) that left signals of their presence in rocks about 3.7 billion years old.