1. 18
Class Amphibia

2. 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: mya

3. 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

4. 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

5. Eggs usually laid in water and fertilized externally22
Eggs usually laid in water and fertilized externally

6. 23

7. Some can produce poison - defense24
Ecology
Food for other animals
Some can produce poison - defense
Blue Poison Frog

8. Turtles, crocodilians, Lizards, and Snakes
Class Reptilia 25

9. 26 Clip Major Characteristics: Dry, scaly skin
Helps prevent water loss
With scales or plates
Lungs
Able to breath air
Clip

10. 27

11. 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

12. 29
Egg covered w/a shell that protects the developing embryo from drying out

13. 30
Limbs, if present, having toes with claws used for climbing, digging, and moving around on land.
Strong limbs
Internal fertilization

14. 31 Body temperature that varies with that of the surroundings.
Cannot generate their own body heat