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Unformatted text preview: 3. Reproduction a. oviparous b. leathery shells 4. Internal fertilization a. first specialized sex organ- penis 5. Scales- made of keratin, horny a. protection from predators b. protection from desiccation 6. Respiration- lungs 7. Heart a. most: 3 chambered b. alligators and crocodiles: 4 chambered (shows relationship to birds) 8. Waste disposal a. Amino Acid breaks down into NH 3 Urea Uric Acid- fish can excrete NH 3 because are surrounded with water- Amphibia, Mammalia need to make urea, dont need a lot of water, NH 3 too toxic- Reptiles, Birds need Uric Acid so they dont need water, least toxic waste i. lay eggs, so waste cant be toxic 9. Poikilotherms- cold blooded or ectoderm, reflect the temperature of their surroundings...
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