FishFish• 3 classes

– Agnatha: jawless fishes• Lamprey, Hagfish

– Chondricthyes: Cartilaginous fishes• Sharks, skates, rays

– Ostichthyes: Bony fishes• All other fishes

• Breathing: gills or gill slits• 2 chambered heart• Sexual Reproduction

– Most external fertilization

• Scales

AmphibiansAmphibians

• Smooth moist skin• Mucous glands

– sometimes associated with poison glands

• Metamorphosis• Ectothermic• Sexual reproduction• Variety of

respiratory modes– Lungs, gills, skin

ReptilesReptiles• Adaptations for life on dry

land• Scales• Legs positioned right

underneath body– Can support body weight better

• 3 chambered heart– Crocs have 4 chambers

• Ectotherms• Sexual reproduction

– Internal fertilization– Amniotic egg

BirdsBirds• Adaptations for flight:

– Feathers– Wings– Hollow bones

• Endothermic• 4 chambered heart• Sexual reproduction

– internal fertilization– Amniotic egg with

hard shell

MammalsMammals• Hair• Endothermic• Provide milk for their

young• 4 chambered heart• Different types of

teeth• Modified limbs

MammalsMammals• Placental Mammals

– Offspring are carried inside the mother until development is almost complete

– Nourishment and oxygen provided via placenta

MammalsMammals• Marsupials–Short period of development

inside mom–Second period of development

in a pouch made of hair and skin

MammalsMammals

• Montremes– Egg laying mammals– Have hair and

mammary glands– Only found in

Austrailia, New Guinea, and Tazmania

– Echidnas and Platypuses