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Last universal ancestor
The
last universal ancestor
(
LUA
), also called the
last universal common ancestor
(
LUCA
),
cenancestor
, or
progenote
, is the most recent
organism
from which all organisms now
living on Earth
have a
common descent
. Thus it is the
most recent common ancestor
(MRCA) of all current life on Earth. The LUA is estimated to have lived some 3.5 to 3.8 billion years ago (sometime in the
Paleoarchean
era
). The earliest evidence for
life on Earth
is
biogenic
graphite
found in 3.7 billion-year-old
metasedimentary rocks
discovered in
Western Greenland
and
microbial mat
fossils
found in 3.48 billion-year-old
sandstone
discovered in
Western Australia
.
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