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biology
amphibia
Question | head and tru |
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other characteristics | internal nares to make breathing possible by keeping mouth closed and reduction in bones to make body lighter |
body division and limbs | head and trunk 2 pairs of pendactyl limbs with 4 5 or fewer digits some without legs like caecillians webbed feet |
skin and exoskeleton | skin smooth moist and rich in glands highly vascular scales mostly absent some glands poisonous |
respiration and metabolism | larval stage by gills and adults by skin and lungs |
heart and ciculation | cold blooded three chambered heart with truncus arteriosus and sinus venosus double circulation |
reproduction | sexes are separate feritilization either internal or external most are oviparous cloaca presence |
eggs characteristics | anamnion no protective shell |
examples | frogs salamender mudpuppy toads |