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Essays on Triassic Nelson- The LongHorned Sculpin
... The sculpins are actually quite highly evolved. Teleost fish arose approximately 200 to 220 million years ago during the middle or late Triassic Nelson 89. ...
(2336 Words -- Approx. 9 Pages) - The nervous system
... the calcichordates and conodonts, are uncertainly related to other Chordata Nelson, 1994 ... while mammals differentiated before the end of the Triassic and birds ...
(2519 Words -- Approx. 10 Pages)
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