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Dinesh

Dinesh club

Posted: 23 Nov 2023

Taken: 23 Nov 2023

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263 •
From •
Evolution •
A Triumph of an Idea •
Author •
Carl Zimmer •

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This evolutionary tree, based on DNA, shows how an ancestral ape gave rise to orangutans, gorillas, chimpanzees, and humans. The length of the branches reflects how far the genes of each population of apes have diverged from their relatives. Humans, the tree reveals, are barely distinguishable on a genetic level from bonobos and chimpanzees
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 Dinesh
Dinesh club
In 1871 Darwin readers may have thought he was firing a scientific shot in the dark. But 130 years later he has been vindicated by a wealth of evidence. . . . . In 1999 an international group of scientists offered an evolutionary tree of humans based on the most extensive study of our genes to date. Humanity forms a little tuft nestled alongside the chimpanzee lineages. Their tree demonstrates that, genetically speaking, we are practically a subspecies of chiimp

By gauging the rate at which our genes mutate, scientists estimate that the last common ancestor of chimpanzees and humans lived 5 million years ago. Since Darwin’s day, paleoanthropologists have discovered many fossil of ancient humans, as well as a dozen other human-like species (huminids). These fossils show that human evolution has marked by five great transitions. The first, which began about 5 million years ago, gradually pushed our ancestors out onto the african savannas. The second saw the invention of the first stone tools about 2.5 million years ago, and the third came a million years later, as crude blades were transformed into massive hand axes. Half a million years ago, our ancestors went through a fourth transition, mastering fire and becoming more adept at making spears and other tools. And finally, 50,000 year ago, humans began leaving behind signs of truly modern minds – painting on cave walls, carved jewellry, intricate weapons, and elaborate burials.
6 months ago. Edited 6 months ago.

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