Which of the following are characteristics or examples of sp

Which of the following are characteristics or examples of sponges? (Select all that apply.)

Answer:

Since no options are given, general characteristics of sponges and their examples are mentioned below:

Characteristics:

Sponges are the common name for the phylum porifera.

1. They are mostly marine and asymmetric animals.

2. They have cellular level of organization.

3. Water enters through minute pores (ostia) in the body wall into a central cavity, spongocoel, from where it goes out through the osculum.

4. Choanocytes (collar cells) line the spongocoel and the canal.

5. Digestion is intracellular.

6. Spicules or spongin fibres form the skeleton in sponges.

7. They are hermaphrodite, that is the sexes are not separate

8. They reproduce asexually by fragmentation and sexually by formation of gametes.

9. Fertilization is internal

10. Development is indirect with a larval stage distinct from the adults.

Examples: Sycon (Scypha), Spongilla (Fresh water sponge), Euspongia (Bath sponge), Demonspongiae, Glass sponges, Calcareous aponges.