Give four general characters of phylum Mollusca. Write down two examples.

Characters of Phylum Mollusca:

(i) Molluscs are terrestrial or aquatic (marine or fresh water) having an organ-system level of organisation.

(ii) They are bilaterally symmetrical, triploblastic and coelomate animals

(iii) They have an open circulatory system and kidney-like organs for excretion.

(iv) Body is covered by a calcareous shell.

Example- Pila and Unio.