NEET BIOLOGY

GENETICS AND EVOLUTION

EVOLUTION

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
Which era did the first bears live in?
A
Miocene era
B
Mesozoic era
C
Messinian era
D
None of the above
Explanation: 

Detailed explanation-1: -Miocene Epoch, earliest major worldwide division of the Neogene Period (23 million years to 2.6 million years ago) that extended from 23 million to 5.3 million years ago.

Detailed explanation-2: -The earliest bears had the characteristics of both dogs and bears, with heavy-set features and blunter teeth than those of true dogs. Modern bears appeared in Eurasia around 5 million years ago during the late Miocene Epoch. These bears were relatively small animals, but some types eventually grew quite large.

Detailed explanation-3: -During the later Miocene mammals were more modern, with easily recognizable canids, bears, red pandas, procyonids, equids, beavers, deer, camelids, and whales, along with now extinct groups like borophagine canids, certain gomphotheres, three-toed horses, and hornless rhinos like Teleoceras and Aphelops.

Detailed explanation-4: -Miocene Epoch (23 – 5.3 MYA) The Miocene was a long-lasting epoch in which the earth’s climate rebounded from the cooling of the Oligocene and there was a marked increase in both global temperatures and the total number of mammal species. Though warmer than the Oligocene, the polar ice caps remained in place.

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