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...
BiologyWise
Biology Wise: Asexual Reproduction in Animals
Provides short descriptions of different methods of asexual reproduction in animals.