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A fish (pl.: fish or fishes) is an aquatic, anamniotic, gill-bearing vertebrate animal with swimming fins and a hard skull, but lacking limbs with digits.Fish can be grouped into the more basal jawless fish and the more common jawed fish, the latter including all living cartilaginous and bony fish, as well as the extinct placoderms and acanthodians.
Fish account for more than half of vertebrate species. As of 2016, there are over 32,000 described species of bony fish, over 1,100 species of cartilaginous fish, and over 100 hagfish and lampreys. A third of these fall within the nine largest families; from largest to smallest, these are Cyprinidae , Gobiidae , Cichlidae , Characidae ...
This fish can range up to 1.5 m (4.9 ft) and weigh 7 kg (15 lb). [77] Seahorses and allies (Syngnathiformes) The largest of this diverse order is the red cornetfish (Fistularia petimba), a long, thin species found in all tropical oceans. This fish can reach a length of 2 m (6.6 ft) and a weight of 4.65 kg (10.3 lb). [77]
However, when considered from the standpoint of rate of size increase per generation, the exponential increase is found to have continued until the appearance of Indricotherium 30 Ma ago. (Since generation time scales with body mass 0.259 , increasing generation times with increasing size cause the log mass vs. time plot to curve downward from ...
In order to be considered fully domesticated, most species have undergone significant genetic, behavioural and morphological changes from their wild ancestors, while others have changed very little from their wild ancestors despite hundreds or thousands of years of potential selective breeding. A number of factors determine how quickly any ...
Ranging from 9 to 98 feet in length, whales are the largest creatures on Earth.Scientists believe the first whales evolved over 50 million years ago, according to the University of California ...
The state of California has taken steps to strengthen animal cruelty laws, including regulations involving farm animals. In 2018, California voters approved Proposition 12, which mandated more ...
The AP reports that about 54 million years ago mammals, humans' earliest primate ancestor included, "shriveled a bit in size at least twice in Earth's history when temperatures spiked."