Earliest known life forms
Earliest known life forms
The earliest known life forms on Earth are microfossil evidence of life that dates back 3.5 to 3.8 billion years ago (Ga). They are the earliest direct evidence of life on Earth.
Pronunciation
- Earliest: /ˈɜːrliɪst/
- Known: /nəʊn/
- Life: /laɪf/
- Forms: /fɔːrmz/
Etymology
The term "earliest known life forms" is a combination of several words. "Earliest" comes from the Old English "ǣrest" meaning "soonest, first, most quickly," "known" comes from the Old English "cnāwan" meaning "to know, perceive; acknowledge, declare," "life" comes from the Old English "līf" meaning "existence, lifetime," and "forms" comes from the Old English "formian" meaning "to form, establish, arrange."
Related terms
- Microfossil: A fossil that requires a microscope to see.
- Ga (unit): A unit of time equal to one billion years.
- Bacteria: A type of biological cell.
- Archaea: A domain and kingdom of single-celled microorganisms.
- Cyanobacteria: A phylum of bacteria that obtain their energy through photosynthesis.
- Stromatolites: Layered sedimentary formations that are created by photosynthetic cyanobacteria.
- Prokaryote: A unicellular organism that lacks a membrane-bound nucleus, mitochondria, or any other membrane-bound organelle.
See also
External links
- Medical encyclopedia article on Earliest known life forms
- Wikipedia's article - Earliest known life forms
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