November 13-ch 24

November 13-ch 24 - November 13, 2007 Chapter 24...

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November 13, 2007 Chapter 24 Lobe-Finned Fishes o Some early groups had modified fleshy fins that could be used to drag themselves from a drying puddle to a deeper pool o Gave rise to the tetrapods Amphibians “Amphi”: double o Two stages of development At least 4,800 species Double life of amphibians o Begin life adapted to aquatic environment (tadpoles have gills) o Mature into semiterrestrial adult with lungs Three chambered heart Most adults respire though lungs and moist skin o Lungs poorly developed o Skin supplements lungs Most have four limbs Reproduce sexually; external fertilization Confined to damp terrestrial habitats o Skin must be moist o External fertilization Eggs and larvae develop in water Reptile and Birds Dinosaurs, lizards, snakes, alligators, crocodiles, turtles (and birds) Adapted for life on land Respire through lungs exclusively Skin is less permeable Fertilization is internal Scales Shelled amniote egg
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This note was uploaded on 04/10/2008 for the course BIOLOGY 101 taught by Professor Beitch during the Spring '07 term at Quinnipiac.

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November 13-ch 24 - November 13, 2007 Chapter 24...

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