Amphibians

Characteristics As adults: – 2 pairs of legs – Lay eggs in water – Obtain oxygen through skin – Smooth, moist skin – Many have lungs Frogs, toads, salamanders

Live in moist environments Reproduce sexually In most species, external fertilization occurs. Lay eggs without shells.

Life Cycle Larva (early stage) – Called tadpole for frogs/toads – Behave like fish – Have tail Over time, it loses tail Develops lungs Then leaves water to live on land

Reptiles

Basic Characteristics MOST have 2 pairs of legs Have tough, dry skin with scales Breathe using lungs Have sensory organs Lay eggs with shells on land Examples- snakes, lizards, iguanas, turtles, alligators

Skin Hard and dry Covered with scales Waterproof Protects them from predators/environment Cannot obtain water through skin.

Eggs with Shells Allows them to survive in hot, dry environments. Reproduce sexually Egg contains everything the embryo needs Young reptiles look like small adults

Ectotherms Amphibians and reptiles are ectotherms- body temperature is controlled by environment. Use sun or water to cool or heat bodies.

Exit Slip 1.What are three basic characteristics of amphibians? 2.What are two examples of amphibians? 3.How do amphibians obtain oxygen? 4.What are three basic characteristics of reptiles? 5.What are three examples of reptiles? 6.How do reptiles obtain oxygen? 7.Explain the difference between amphibian and reptile eggs. 8.List three animals that are ectotherms. 9.List three animals that are endotherms.