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The word fish is inherited from Proto-Germanic, and is related to German Fisch, the Latin piscis and Old Irish īasc, though the exact root is unknown; some authorities reconstruct a Proto-Indo-European root *peysk-, attested only in Italic, Celtic, and Germanic.
The evolution of fish began about 530 million years ago during the Cambrian explosion. It was during this time that the early chordates developed the skull and the vertebral column, leading to the first craniates and vertebrates. The first fish lineages belong to the Agnatha, or jawless fish. Early examples include Haikouichthys.
Jul 28, 2012 · Somewhere around 430 million years ago, plants and colonized the bare earth, creating a land rich in food and resources, while fish evolved from ancestral vertebrates in the sea.
Mar 12, 2022 · fish. (n.) "a vertebrate which has gills and fins adapting it for living in the water," Old English fisc "fish," from Proto-Germanic *fiskaz (source also of Old Saxon, Old Frisian, Old High German fisc, Old Norse fiskr, Middle Dutch visc, Dutch vis, German Fisch, Gothic fisks ), perhaps from PIE root *pisk- "a fish."
1.a. Originally: any of various vertebrate or invertebrate animals living exclusively or chiefly in water. In later use: spec. any of a large and varied group of aquatic vertebrates, most of which are cold-blooded and have gills and fins. angelfish, flatfish, flying fish, goldfish, sunfish, swordfish, etc.: see the first element.
Between 390 and 360 million years ago, the descendents of these organisms began to live in shallower waters, and eventually moved to land. As they did, they experienced natural selection that shaped many adaptations for a terrestrial way of life. Like other terrestrial sarcopterygians, modern humans still carry the evidence of our aquatic past ...
Jul 18, 2022 · Hundreds of millions of years is a long time ago. – Josh, age 11, Ephrata, Pennsylvania. The oldest fossils of animals resembling a fish date back between 518 million and 530 million years ago ...
