Classification

Has a backbone

• Vertebrate
• Invertebrate

lays eggs, has scaly skin, breathes with gills

• amphibian
• reptile
• fish
• reptile

lays eggs, breathes with lungs, has feathers

• mammal
• bird
• amphibian
• fish

warm-blooded, hair or fur, breathes with lungs, live birth

• bird
• reptile
• amphibian
• mammal

lays eggs, has scales, dry, scaly skin, cold-blooded

• amphibian
• fish
• mammal
• reptile

lays eggs, smooth, moist (wet) skin, breathes with lungs, begins life in water but moves to land as an adult, cold-blooded

• reptile
• fish
• amphibian
• mammal

has a constant body temperature

• cold-blooded
• warm-blooded

body temperature changes based on its surroundings

• cold-blooded
• warm-blooded