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1. en.wikipedia.org › wiki › Marine_mammalMarine mammal - Wikipedia

   en.wikipedia.org › wiki › Marine_mammal

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   5 days ago · Marine mammals are mammals that rely on marine (saltwater) ecosystems for their existence. They include animals such as cetaceans ( whales, dolphins and porpoises ), pinnipeds ( seals, sea lions and walruses ), sirenians ( manatees and dugongs ), sea otters and polar bears. They are an informal group, unified only by their reliance on marine ...

2. en.wikipedia.org › wiki › Evolution_of_mammalsEvolution of mammals - Wikipedia

   en.wikipedia.org › wiki › Evolution_of_mammals

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   3 days ago · The evolution of mammals has passed through many stages since the first appearance of their synapsid ancestors in the Pennsylvanian sub-period of the late Carboniferous period. By the mid-Triassic, there were many synapsid species that looked like mammals.

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   When did mammals evolve?

   • The evolution of mammals has passed through many stages since the first appearance of their synapsid ancestors in the Pennsylvanian sub-period of the late Carboniferous period. By the mid- Triassic, there were many synapsid species that looked like mammals.

   Evolution of mammals - Wikipedia

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   How did marine mammals evolve in convergent evolution?

   • In a process of convergent evolution, marine mammals, especially cetaceans such as dolphins and whales, redeveloped their body plan to parallel the streamlined fusiform body plan of pelagic fish. Front legs became flippers and back legs disappeared, a dorsal fin reappeared and the tail morphed into a powerful horizontal fluke.

   Marine life - Wikipedia

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   What was the earliest aquatic mammal?

   • Previously the earliest was Eomaia, a crown group mammal from about 125M years ago. It had aquatic adaptations including flattened tail bones and remnants of soft tissue between the toes of the back feet, suggesting that they were webbed. Previously the earliest known semi-aquatic mammaliaforms were from the Eocene, about 110M years later.

   Evolution of mammals - Wikipedia

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   When did marine reptiles arose?

   • The earliest marine reptiles arose in the Permian. During the Mesozoic many groups of reptiles became adapted to life in the seas, including ichthyosaurs, plesiosaurs, mosasaurs, nothosaurs, placodonts, sea turtles, thalattosaurs and thalattosuchians. Marine reptiles were less numerous after mass extinction at the end of the Cretaceous .

   Marine life - Wikipedia

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4. www.nhm.ac.uk › discover › newsEarliest animal ecosystems may have played a role in the ...

   www.nhm.ac.uk › discover › news

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   May 17, 2024 · First published 17 May 2024. 0. The first animal communities could have had a big impact on how complex life evolved over 550 million years ago. These early marine ecosystems are thought to have affected the distribution of nutrients like food and oxygen in the oceans.

5. www.britannica.com › science › Paleozoic-EraPaleozoic Era | Description, Climate, & Facts | Britannica

   www.britannica.com › science › Paleozoic-Era

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   May 3, 2024 · Paleozoic Era, major interval of geologic time that began 538.8 million years ago with the Cambrian explosion, an extraordinary diversification of marine animals, and ended about 252 million years ago with the end- Permian extinction, the greatest extinction event in Earth history.

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6. Videos

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     The Evolution of the First Mammals

     Mar 8, 2017

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     The Evolution of Mammals (Every Mammal Family Explained)

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     The Biology of Marine Mammals - Palomar College

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7. www.smithsonianmag.com › smart-news › belugas-mayBelugas May Communicate by Changing the Shape of Their ...

   www.smithsonianmag.com › smart-news › belugas-may

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   May 10, 2024 · Belugas ( Delphinapterus leucas) are social marine mammals that live in Arctic and sub-Arctic waters, including off the coast of Alaska. On average, they weigh 3,150 pounds and can measure up to ...

8. www.britannica.com › science › Cambrian-explosionCambrian explosion | Evolution, Paleontology & Geology

   www.britannica.com › science › Cambrian-explosion

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   May 20, 2024 · May 18, 2024, 1:58 AM ET (CBC) New exhibit at Royal Tyrrell Museum features fossils from beginning of life on Earth. Cambrian explosion, the unparalleled emergence of organisms between 541 million and approximately 530 million years ago at the beginning of the Cambrian Period.

9. en.wikipedia.org › wiki › Marine_lifeMarine life - Wikipedia

   en.wikipedia.org › wiki › Marine_life

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   5 days ago · The first marine birds evolved in the Cretaceous period, and modern marine bird families emerged in the Paleogene. Mammals Sea otter, a classic keystone species which controls sea urchin numbers