University of California
Ucmp: Life History and Ecology
Learn how sponges eat, grow, reproduce on this colorful page.
Missouri Botanical Garden
Missouri Botantical Garden: Sponges!
This site from The Evergreen Project gives an easy to understand description of the Sponges.
CK-12 Foundation
Ck 12: Biology: Sponges
[Free Registration/Login may be required to access all resource tools.] Discusses characteristics of sponges.
CK-12 Foundation
Ck 12: Life Science: Sponges
[Free Registration/Login may be required to access all resource tools.] Sponges are classified in the phylum Porifera, from the Latin words meaning "having pores." Sponges are sessile, meaning they cannot move, so they filter water...
Other
Sponges, Phylum Porifera
Discusses sponges that may be kept in salt-water aquariums, along with what they need to live. Good general information.