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3 days ago · The first clue came in the summer of 2022, when the virus killed hundreds of seals in New England and Quebec. ... it’s likely the virus evolved to spread directly among the marine mammals: In ...
3 days ago · What did mammals evolve from? Mammals evolved from a group of reptiles called therapsids , which lived from 299 million to 200 million years ago. Therapsids were quadrupedal and had such mammalian features as specialized tooth structures and an opening in the temporal region of the skull.
5 days ago · Dolphin. A dolphin is an aquatic mammal within the infraorder Cetacea. Dolphin species belong to the families Delphinidae (the oceanic dolphins), Platanistidae (the Indian river dolphins ), Iniidae (the New World river dolphins), Pontoporiidae (the brackish dolphins), and possibly extinct Lipotidae (baiji or Chinese river dolphin).
3 days ago · human evolution, the process by which human beings developed on Earth from now-extinct primates. Viewed zoologically, we humans are Homo sapiens, a culture -bearing upright-walking species that lives on the ground and very likely first evolved in Africa about 315,000 years ago. We are now the only living members of what many zoologists refer to ...
3 days ago · Ichthyosauria (Ancient Greek for "fish lizard" – Ancient Greek: ἰχθύς, romanized : ichthys, lit. 'fish' and Ancient Greek: σαῦρος, romanized : sauros, lit. 'lizard') is an order of large extinct marine reptiles sometimes referred to as "ichthyosaurs", although the term is also used for wider clades in which the order resides.
Apr 5, 2024 · trilobite, any member of a group of extinct fossil arthropods easily recognized by their distinctive three-lobed, three-segmented form. Trilobites, exclusively marine animals, first appeared at 521 million years ago near the beginning of the Cambrian Period (538.8 million to 485.4 million years ago), when they dominated the seas.
Apr 10, 2024 · Today’s mammals are the product of 200 million years of evolution, but scientists aren’t sure exactly how features of modern mammals came to be. A twin pair of studies published in the journal ...
