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OVERVIEW OF AMPHIBIANS

Characteristics. Scientists infer that amphibians evolved from lobe-finned fishCold-blooded:Enter a state of dormancy when weather is badHibernation vs. estivation. Characteristics, cont.. Go through metamorphosisChange from an aquatic larval stage to a terrestrial adultHave moist, smooth, thi

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OVERVIEW OF AMPHIBIANS

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    1. OVERVIEW OF AMPHIBIANS

    2. Characteristics Scientists infer that amphibians evolved from lobe-finned fish Cold-blooded: Enter a state of dormancy when weather is bad Hibernation vs. estivation

    3. Characteristics, cont. Go through metamorphosis Change from an aquatic larval stage to a terrestrial adult Have moist, smooth, thin skin with no scales Feet, if present, are webbed and toes lack claws

    4. Characteristics, cont. Use gills, lungs, skin, and mouth cavity in respiration Larvae has 2 chamber heart; adult has 3 chambers Eggs lack multicellular membranes or shells Usually laid in water or in a moist environment Fertilized externally

    5. CLASSIFICATION

    6. Order Anura “without a tail” Live in deserts, mountains, ponds Frogs have smooth, moist skin Long hind legs Most live in or near water Return to water to reproduce

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