when the phase of ice age came in being?what changes it bring into human evolution
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Answer:
The Ice Ages began 2.4 million years ago and lasted until 11,500 years ago. During this time, the earth's climate repeatedly changed between very cold periods, during which glaciers covered large parts of the world , and very warm periods during which many of the glaciers melted.
Human evolution was very likely affected strongly by the dramatic climate swings of the Pleistocene. These changes no doubt presented powerful new natural selection pressures. Many animal species were driven to extinction by the advancing and retreating ice ages. Humanity survived primarily by becoming more intelligent and adaptable. This allowed us to develop new cultural technology to deal with cold environments and changing food sources, especially during the last 1/4 million years. One of the greatest problems in the cold regions would have been the relative scarcity of plant foods that humans could eat during the winters. In response to this, our ancestors became more proficient at hunting animals, especially large ones that provided more calories. This required inventing more sophisticated hunting skills as well as better weapons and butchering tools. These changes in subsistence pattern were essential for our survival.
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