18 Class Amphibia

Major Characteristics: 19 Clip “Double Life” Major Characteristics: Lives in water as a larvae and on land as an adult Moist skin Breathes with lungs as an adult Lacks scales and claws Must return to water to reproduce. Age of amphibians: 360-286 mya

20 Salamanders, newts, frogs, and toads Success on Land: Lungs, stronger bones in limbs to help support weight out of water, breastbone to protect internal organs. 20 Frog &Toads Salamanders, newts, frogs, and toads First vertebrates to adapt to life on land Young can only live in water Undergo metamorphosis and can live on land tadpole stage can regenerate lost parts

Smooth skin, no scales, feet are webbed, toes are soft and lack claws Respiration through gills, lungs and/or skin no external ears: have eardrums or tympanic membranes 21

Eggs usually laid in water and fertilized externally 22 Eggs usually laid in water and fertilized externally

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Some can produce poison - defense 24 Ecology Food for other animals Some can produce poison - defense Blue Poison Frog

Turtles, crocodilians, Lizards, and Snakes Class Reptilia 25

26 Clip Major Characteristics: Dry, scaly skin Helps prevent water loss With scales or plates Lungs Able to breath air Clip

27

28 Oviparous: animals that lay eggs One of the most important Lay eggs with several membranes Oviparous: animals that lay eggs One of the most important adaptations for life on land. Does not need water for reproduction

29 Egg covered w/a shell that protects the developing embryo from drying out

30 Limbs, if present, having toes with claws used for climbing, digging, and moving around on land. Strong limbs Internal fertilization

31 Body temperature that varies with that of the surroundings. Cannot generate their own body heat