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The evolution of cetaceans is thought to have begun in the Indian subcontinent from even-toed ungulates (Artiodactyla) 50 million years ago (mya) and to have proceeded over a period of at least 15 million years. [2] Cetaceans are fully aquatic mammals belonging to the order Artiodactyla and branched off from other artiodactyls around 50 mya.
Probable causes [2] Quaternary: Holocene extinction: c. 10,000 BC – Ongoing: Humans [3] Quaternary extinction event: 640,000, 74,000, and 13,000 years ago: Unknown; may include climate changes, massive volcanic eruptions and Humans (largely by human overhunting) [4] [5] [6] Neogene: Pliocene–Pleistocene boundary extinction: 2 Ma
2.5.4.5 Family incertae sedis. 2.5.5 Superfamily Balaenopteroidea. ... The cetaceans (whales, dolphins and porpoises) are descendants of land-living mammals, ...
To commemorate the 50th anniversary of the Dolphins’ Perfect Season, The Miami Herald is running weekly conversations with members of the 1972 team that went 17-0.
During the Paleocene Epoch (about 66 - 55 million years ago), the ancient whale Pakicetus began pursuing an amphibious lifestyle in rivers or shallow seas. It was the ancestor of modern whales, dolphins, and porpoises. The cetacea are extensively adapted to marine life and cannot survive on land at all.
THE 1972 MIAMI DOLPHINS ROSTER ... which he battled for 13 years. Highlight: He had 2.5 sacks in 14 games and ... He had a fumble recovery in ‘72 and was a key part of the Dolphins’ run ...
the 1972 miami dolphins roster number, name, position: current status, ‘72 highlight A ’72 Dolphins 50th anniversary special: A look at all 45 players from that team Skip to main content
Stone tools found at the Shangchen site in China and dated to 2.12 million years ago are considered the earliest known evidence of hominins outside Africa, surpassing Dmanisi hominins found in Georgia by 300,000 years, although whether these hominins were an early species in the genus Homo or another hominin species is unknown. [37