Examlex
Which choice is the correct sequence from smallest to largest?
Toumai
A nickname for Sahelanthropus tchadensis, one of the oldest known species in the human lineage, discovered in Chad, Africa dating to about 7 million years ago.
Orrorin
An early hominin genus dating back to about 6 million years ago, speculated to be among the first bipedal primates.
Ardipithecus
One of the earliest genera of bipeds that lived in eastern Africa. Ardipithecus is actually divided into two species, the older of which dates to between 5.2 and 5.8 million years ago, and the younger, A. ramidus, dated to around 4.4 million years ago.
Spinal Column
The flexible longitudinal column made of a series of bones called vertebrae, which houses the spinal cord and provides structural support to the body.
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