5 Reptile Characteristics
a. Covered with tough, dry scales
c. Breath with lungs throughout their lives
d. Three-chambered heart with a ventricle that is partially divided
e. Produce amniotic eggs covered with a leathery shell, most oviparous, some ovoviviparous
6 Bird Characteristics
b. Heart with four chambers
c. Toothless bill
d. Oviparous, laying an amniotic egg that is covered in a lime-containing shell
e. Covered with feathers
f. Skeleton composed of porous, lightweight bones (not a characteristic of all birds)
5 Mammal Characteristics
a. Hair covering the skin
b. Reproduce with internal fertilization and usually viviparous
c. Nourish their young with milk secreted from specialized glands
d. Four-chambered heart
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