We don't really know what happened to the animals, but they all seem to have disappeared at the same time, about 13 million years ago
,'' Reynolds said.
There had to have been a river flowing over a land connection 13 million years ago
Although humans and chimps appear to have last shared a common genetic ancestor 13 million years ago
, McVean says that the figure does not necessarily mean that the human and chimp lineages separated then.
coli lost that trait more than 13 million years ago
, so when bacteria in one flask--designated Ara-3 (shown below)--started gorging on the chemical, scientists were fascinated.
The whale (depicted above) lived between 12 million and 13 million years ago
, says Olivier Lambert, a vertebrate paleontologist at the National Museum of Natural History in Paris.
Soybean's set of chromosomes has copied itself at least twice, approximately 59 million years ago the first time and then again about 13 million years ago
, Jackson and his colleagues report in the Jan.
Then, 13 million years ago
, snakehead fossils disappeared from Europe.
According to the new study, reported in the June 13 Science, the Basin and Range reached some 3,000 meters above sea level 16 million years ago, then dropped to its present height by about 13 million years ago