Each learning path is one chapter: a guided route through a topic, one small course at a time. Pick a class to see its chapters in order.
A sponge, an earthworm, a starfish and a tiger are all animals, yet they share almost nothing at first sight. Zoologists sort more than a million kinds of animals by a few features of the body. In this chapter you learn those features, then meet each phylum in turn, from the sponges to the chordates, and the classes of vertebrates. Python builds a key that names an animal's phylum from its features.