Animated Fish Swimming and Doing Different Actions See and Enjoy Fish Gif Images and Clipart Collection 6

 





Animated Fish Swimming and Doing Different Actions See and Enjoy Fish Gif Images and Clipart Collection 6



Fish do not represent a monophyletic group, and therefore the "evolution of fish" is not studied as a single event.
Early fish from the fossil record are represented by a group of small, jawless, armored fish known as Ostracoderms. Jawless fish lineages are mostly extinct. An extant clade, the Lampreys may approximate ancient pre-jawed fish. The first jaws are found in Placodermi fossils. The diversity of jawed vertebrates may indicate the evolutionary advantage of a jawed mouth. It is unclear if the advantage of a hinged jaw is greater biting force, improved respiration, or a combination of factors.



































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