Ch 12 Proterozoic Eon
Proterozoic Eon
Proterozoic Eon
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Early <strong>Proterozoic</strong> life<br />
• Earliest fossil evidence of eukaryotes is<br />
single-celled algae (protists), ~2.1 Ga,<br />
although indirect genetic evidence suggests<br />
the possibility of Archean eukaryotes<br />
• Eukaryotic cell probably originated from<br />
the union of two prokaryotic cells, with one<br />
engulfing the other (“endosymbiont<br />
theory”)<br />
Earth History, <strong>Ch</strong>. <strong>12</strong> 6
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