Animal Kingdom Dichotomous Key

Backbone

Vertebrate

Internal fertilization

Warm-Blooded

hair

Mammalia

Mammalia

feathers

Aves

Cold Blooded

Breathe with lungs

Reptillia

No lungs

Chondrichthyes

Subtopic

Subtopic

External fertilization

Legs

Amphibia

Amphibia

No legs

Bone

Actinopterygii

Cartilage

Agnathans

Invertebrate

Circulatory system

Mollusca

No circulatory system

Coelom

Digestive system

Aquatic

Freshwater

Annelida

Marine

Echinodermata

Terrestrial

Arthropoda

Arthropoda

Digestive tract

Parasitic

Nematoda

Harmless

Rotifera

No Coelom

Nerves

Bilateral

Platyhelminthes

Radial

Cnideria

Cnideria

No nerves

Porifera