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Lecture 6 ANIMAL EVOLUTION: THE VERTEBRATES

Lecture 6 ANIMAL EVOLUTION: THE VERTEBRATES. The chordates. A notochord: a long rod of stiffened tissue (not bone/cartilage); as a support. Tubular, dorsal nerve cord: runs parallel to the notochord & gut, anterior end develops into brain. Gill slits punctuates the wall of pharynx:

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Lecture 6 ANIMAL EVOLUTION: THE VERTEBRATES

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  1. Lecture 6ANIMAL EVOLUTION: THE VERTEBRATES

  2. The chordates

  3. A notochord: • a long rod of stiffened tissue (not bone/cartilage); as a support. • Tubular, dorsal nerve cord: • runs parallel to the notochord & gut, anterior end develops into brain. • Gill slits punctuates the wall of pharynx: • a muscular tube that function sin feedings, respiration or both. • Tail extending past an anus.

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