Question

What Is Known As The Sixth Extinction

Answer 1

Explanation:

We can divide the Sixth Extinction into two discrete phases:

* Phase One began when the first modern humans began to disperse to different

parts of the world about 100,000 years ago.

*Phase Two began about 10,000 years ago when humans turned to agriculture.

The first phase began shortly after Homo sapiens evolved in Africa and the

anatomically modern humans began migrating out of Africa and spreading

throughout the world. Humans reached the middle east 90,000 years ago. They

were in Europe starting around 40,000 years ago. Neanderthals, who had long lived

in Europe, survived our arrival for less than 10,000 years, but then abruptly

disappeared — victims, according to many paleoanthropologists, of our arrival

through outright warfare or the more subtle, though potentially no less devastating

effects, of being on the losing side of ecological competition.

Everywhere, shortly after modern humans arrived, many (especially, though by no

means exclusively, the larger) native species typically became extinct. Humans

were like bulls in a China shop:

*They disrupted ecosystems by overhunting game species, which never

experienced contact with humans before.

*And perhaps they spread microbial disease-causing organisms as well.

The fossil record attests to human destruction of ecosystems:

*Humans arrived in large numbers in North America roughly 12,500 years ago-and

sites revealing the butchering of mammoths, mastodons and extinct buffalo are

well documented throughout the continent. The demise of the bulk of the La Brea

tar pit Pleistocene fauna coincided with our arrival.

* The Caribbean lost several of its larger species when humans arrived some 8000 years ago

* Extinction struck elements of the Australian megafauna much earlier-when

humans arrived some 40,000 years ago. Madagascar-something of an anomaly,

as humans only arrived there two thousand years ago-also fits the pattern well:

the larger species (elephant birds, a species of hippo, plus larger lemurs) rapidly

disappeared soon after humans arrived.

Indeed only in places where earlier hominid species had lived (Africa, of course, but

also most of Europe and Asia) did the fauna, already adapted to hominid presence,

survive the first wave of the Sixth Extinction pretty much intact. The rest of the

world’s species, which had never before encountered hominids in their local

ecosystems, were as naively unwary as all but the most recently arrived species

(such as Vermilion Flycatchers) of the Galapagos Islands remain to this day.

Answer 2

Answer:

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The Holocene extinction, otherwise referred to as the sixth mass extinction or Anthropocene extinction, is an ongoing extinction event of species during the present Holocene epoch (with the more recent time sometimes called Anthropocene) as a result of human activity.