Sahelanthropus tchadensis dating techniques

Around 10 million years ago, several species of large-bodied hominids that bore some resemblance to modern orangutans lived in Africa and Asia.

About this time, the world began to cool; grassland and savanna habitats spread; and forests began to shrink in much of the tropics.

Why is it difficult to trace the early evolutionary heritage of New World Monkeys?

One could argue that New World Monkeys came from North America, but the fossil links are not there and any such ancestor would also have had to raft over to South America.

If we exclude Ardipithecus which precedes them, and include the genus Paranthropus (the robust australopithecines), there are eight species of australopithecines: anamensis, afarensis (including bahrelghazali which is probably not a separate species), africanus and P. The australopithecines differed from later people not only in their morphology [form], but also in their pattern of growth and maturation and in their shared tendency to very small body size, particularly for females [e.g.,] the . africanus skeletons) all indicate adaptations for tree climbing.

A decade or more of female post reproductive life is a uniquely human trait that may have appeared first in Homo ergaster at roughly 1.7 my ago, in H. CLIMATIC CHANGE (3-2.5 mya) -- this was a major period of climatic change where climates became cooler and drier in East and South Africa, leading to a mosaic of forest and savanna grasslands.

Find rejected as not a hominid & on wrong continent. 3.3 mya Lucy's baby -- skull and much of skeleton preserved; helps understand developmental history of A. ---1 mya old fossil homind jaw in Europe --oldest ever found!

The evidence is growing that while climatic change led to the extinction of apes in Europe, some European apes migrated BACK TO AFRICA ca.Birds and mammals diversified to exploit the increase in both edible plant parts and insects.The primate order branched off the insectivore evolutionary line, perhaps as a result of the proliferation of insects. 35 mya or somewhat later, an early monkey form made it from Africa to South America and eventually underwent adaptive radiation resulting in 70 species of New World Monkeys.9-10 mya to become the ancestors of the gorilla and chimpanzees and ultimately the hominids Earliest Miocene apes found in Africa beginning at least 23 mya; Continental Drift would lead to Africa docking with Eurasia about 17 mya; this allowed the adaptive radiation of apes out of Africa into Eurasia for the fir.Data also suggest that some of the European apes would eventually return to Africa as conditions became colder in Europe and that one or more of these genera was ancestral to gorillas, chimps, and ultimately hominids.

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Between 4 million and 2 million years ago, the hominid lineage diversified, creating a community of several hominid species that ranged through eastern and southern Africa.

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