Warm up

1. What characteristics are similar between fish and amphibians?

2. What characteristic do both of these animal phyla share with all chordates?

PREVENT WATER LOSS to live on land…Dry, hard, plate-like scales

Thick skin

Amniotic egg

Egg Comparison…

Atrium

ventricle

three-chambered heart Double-looped circulatory system

ECTOTHERMIC-Must maintain body temp using surroundings

Feathers for flightDifferent types for different jobs

Bonesthin and hollow

Amniotic egg

ENDOTHERMICHigh body temps (over 104oF)High metabolismPant to cool!

Eat a lot

4 Complete Heart ChambersDouble-looped circulatory system