Here’s the presentation for the Classification topic:

Follow the links in the images to learn more.

There’s a good wiki article on Classification here.

Here are some decent links to free organism identification resources:

Rapid Color Guides do loads of pdf files on tropical plants, lichens and animals.

The Mekong River has been extensively catalogued in terms of invertebrate life.

Riverwatch has a more user-friendly identification guide, that goes to Order level.

And a couple of rocky shore guides can be found here and here.

You can even carry out a virtual rocky shore transect from the British Ecological Society.

And there are a load of awesome resources at the UCLA OceanGlobe Student Resources site.