Comparative anatomy prevails in the lesson exploring diversity among invertebrates. Biologists examine physical characteristics of an earthworm from phylum annelida and a meal worm from phylum insecta. They also inspect a cricket and a...

Students describe vertebrates in terms of observable body parts and characteristics and describe life cycles of familiar organisms. They identify familiar organisms as part of a food chain or food web and describe their feeding...

Students explore the diversity of life forms and the role that interdependency plays in our world through a mult-segmented unit. This segment introduces the unit.

Article explaining the basic characteristics of mammals, their diet, reproduction, behavior, conservation concerns, taxonomy, and their evolution. (Published: September 23, 2010)

A concise site that describes the four basic features that all chordates share.

Pictures of vertebrates.

Pictures of vertebrates.