1. First Assignment  Start a new section for Chapter 42  Answer in binders:  Name 10 examples of vertebrates

2. Prior Knowledge  What do you know about frogs?

3. Chapter 42 Amphibians

4. GOAL 1:  Five major characteristics of living amphibians  1. metamorphosis  2. moist, thin skin; no scales  3. webbed feet (no claws)  4. use gills, lungs, skin in respiration  5. external fertilization; eggs laid in water and lack shells

5. GOAL 2:  Three orders of living amphibians

6. 1. ANURA- tailless amphibians frogs and toads

7. 2. URODELA- with tails salamanders

8. 3. APODA- without legs caecilians

9. 42-2 Characteristics of Amphibians

10. GOAL 4:  Amphibians live in moist or wet environments:  Skin must allow rapid diffusion of gases  Mucus glands- keep skin moist

11. GOAL 5:  The skeleton of the frog absorbs shocks when the frog jumps  Hind legs are long  Tibia and fibula are fused  Radius and ulna are fused  The pectoral and pelvic girdles transfer body weight to the limbs

12. GOAL 6:

14. GOAL 7:  How a frog fills its lungs with air:  Air goes into mouth by lowering the floor of its mouth cavity  Air is pumped into lungs by raising its mouth and closing nostrils  Lungs force air back out of the mouth  Nostril opens and floor of mouth rises to force air out

15. Homework:  Read pages 818-829 in textbook  Complete BOTH sides of Homework handout  INVERTEBRATE assignment is DUE tomorrow. Meet in our classroom.

16. FIRST ASSIGNMENT:  Make a new section in your binders for Chapter 17 Amphibians.  Write down EVERYTHING you know about frogs.