text: 1. air breathing vertebrate with lungs as adults which need to be close to water and land; water esp for reproduction and during their metamorphosis from larva to adult\n2. smooth, thin slimey skin thru which most oxygen-CO2 exchange takes place; skin is hairless, featherless and scaleless\n3. 3 chambered heart- 2 atria, 1 ventricle\n4. oviparous, anamniote gel eggs\n5. larval stage has gill slits and is aquatic\n6. external fertilization