what are the distinguish characters of chordata
Answers
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Four distinctive derived characteristics of chordates distinguish them from their ancestors:
A. Notochord, or a rod of vacuolated cells, encased by a firm sheath that lies ventral to the neural tube in vertebrate embryos and some adults.
B. Hollow nerve cord that lies dorsal to the notochord
C. Pharyngeal pouches
D. Endostyle - elongated groove in the pharynx floor of protochordates that may develop as the thyroid gland in chordates
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Here is your answer.
1. Single hollow nerve cord beneath dorsal surface in vertebrates it differentiates into brain and spinal cord
2. Notochord . flexible rod on the dorsal side of gut, present at one stage in all chordates displaced in vertebrates by vertebral column that forms around the nerve cord.
Characteristics of Chordata. Animals in the phylum Chordata share four key features that appear at some stage during their development: a notochord, a dorsal hollow nerve cord, pharyngeal slits, and a post-anal tail. In some groups some of these are present only during embryonic development.
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