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CHORDATA NAOMI, KINJAL, ASAAD, BINOY
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Segmented Body Chordata animals usually have segmented bodies. They are segmented by Head- Thorax- Abdomen
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Symmetry O Chordates are bilaterally symmetrized
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Skeleton & Appendages O Chordata contain an inner skeleton with a backbone. O They usually have four appendages: Arms, Legs, Wings, or Fins.
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Germ Layers 3 germ layers Germ layers are a group of cells formed by embryogenesis, process by which the embryo is formed and developed Animals with bilateral symmetry produce three germ layers
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Reproduction Chordates reproduce sexually Some species lay eggs while others bear live young Bear live young: the female becomes pregnant, she is pregnant for a period of time, and then the offspring is born live Some species of fishes and reptiles don’t reproduce
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Digestive System O Tubelike digestion, gastrointestinal tract, an extensive tube extending from the mouth to the anus O Swallowing, digestion, and assimilation of food and elimination of waste
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Circulatory System Closed circulatory system Blood transported around body, inside veins and arteries of various sizes Blood circulated by pumping of heart 4 chamber heart, double circulation of the blood Separate circulation for the heart and lungs and for the heart and the rest of the body (systematic circulation)
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Habitat O Most ecological niches O Deepest sea trenches to air (birds) to artic regions (seals, bears, fishes) to arid regions (leopards)
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Respiratory System Exhale carbon dioxide and inhale oxygen They use either a pharynx or gill slits to respire
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Coelom Chordates are coelomates They have fluid filled body cavity and a complete lining from the mesoderm, one germ layer that covers the embryo Organs can be attached in a specific order and have space to move around Most bilateral organisms are coelomates
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Cephalization The notochord is an elongate, rod-like, skeletal structure dorsal to the gut tube and ventral to the nerve cord Chordates have a nervous system based upon a hollow nerve cord (spinal cord) located in their back. Most have a brain too. Invertebrates have double, solid, ventral nerve cords.
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