Assertion: sexual reproduction | /r/AtLocation | the proterozoic eon
Facets:
Source sentences:
text: In the eukaryotic fossil record, sexual reproduction first appeared by 1.2 billion years ago in the Proterozoic Eon.
text: In the eukaryotic fossil record, sexual reproduction first appeared by 1.2 billion years ago in the Proterozoic Eon.