Test 3- Outline+2b

Test 3- Outline+2b - NOTES FOR BIOLOGY 1002 SECTIONS 001...

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NOTES FOR BIOLOGY 1002 SECTIONS 001 and 002 Outline 2B CHAPTER 23 Animal Diversity II: Vertebrates The last group of animals features four new characteristics (see fig 23-2): Notochord and Nerve cord Nerve cord: bundle of nerves, running length of organism. Acts as spinal cord; Controls actions of rest of body; associated with dorsal surface of organism Notochord: embryonic structure that’s there for building purposes Gill slits Tails The organisms with these (and other features) are the: Chordates - Phylum Chordata Tunicate figure Lancelet figure : nerve cord and notochord that run down length o Developed tail for swimming o Developed gill slits to breathe underwater The characteristics include: Cephalization Segmentation (reduced but present) Closed circulatory system Excretory system Well-developed nervous system Includes groups with: o No skeleton - invertebrate (see fig 23-2) o Primitive cartilage skeleton - jawless fish (see fig 23-3)
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This note was uploaded on 04/29/2008 for the course BIOL 1002 taught by Professor Pomarico during the Spring '08 term at LSU.

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Test 3- Outline+2b - NOTES FOR BIOLOGY 1002 SECTIONS 001...

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