write 4 points of spongilla
Answers
Explanation:
Spongilla is a genus of freshwater sponges in the family Spongillidae found in lakes and slow streams. Sponges of the genus Spongilla attach themselves to rocks and logs and filter the water for various small aquatic organisms such as protozoans, bacteria, and other free-floating pond life. Unlike marine sponges, freshwater sponges are exposed to far more adverse and variable environmental conditions, so they have developed gemmules as a means of dormancy. When exposed to excessively cold or otherwise harsh situations, the sponges form these gemmules, which are highly resistant "buds" that can live dormant after the mother sponge has died. When conditions improve, the gemmules "germinate" and a new sponge is born.
Answer:1Canal system is rhagon type.
2Skeleton consists of siliceous spicules in form of network of smooth or spiny large and small oxeas (curved monaxons) embedded in the spongin fibres.
3Reproduction both sexual and asexual. Asexual by gemmules and sexual through an unusual free swimming larva characteristic of Spongilla.
Explanation: