A:2:2

Front 1

vertebrate

Back 1

animals with a backbone as part of their endoskeleton; the second largest group of animals on earth

Front 2

warm-blooded

Back 2

vertebrates that maintain their own body temperature by breaking down food to make heat energy; birds or mammals

Front 3

cold-blooded

Back 3

vertebrates whose body temperature changes with the surrounding temperature; have moist skin and are covered with scales; fish, amphibians, and reptiles

Front 4

amphibian

Back 4

a cold-blooded vertebrate that spends part of its life in water and part on land; live near water because skin must be kept moist
has lungs, but also breathes through the skin; frogs, toads, and salamanders

Front 5

classes of vertebrates

Back 5

mammals, birds, reptiles, amphibians, bony fish, cartilaginous fish, and jawless fish

Front 6

reptile

Back 6

cold-blooded vertebrate who live on land and have tough, dry, scaly skin that holds in moisture; can't breathe through skin, have lungs; lay tough eggs; snakes, lizards, turtles, and crocodiles

Front 7

bird

Back 7

warm-blooded vertebrates with scales on beaks and feet; have feathers which are lightweight to keep them warm and dry; powerful lungs help most birds to fly; hollow bones make body light enough to fly;

Front 8

mammal

Back 8

warm-blooded vertebrate with hair or fur; females produce milk to feed young; give birth to live young; (platypus and spiny anteater are only mammals to lay eggs);

Front 9

tadpoles

Back 9

amphibians who turn into frogs during their life cycle

Front 10

cartilage

Back 10

rubbery skeleton in lampreys, sharks, and rays

Front 11

fish

Back 11

cold-blooded vertebrates classified as jawless fish, cartilaginoue fish, and bony fish