What is the function of radula?

What is the function of muscular foot and radula in a mollusca.

Name a 'living fossil' Arthropod. What is radula? What is the function of water vascular system?

What is function?

What is the role of radula in molluscs?

What is the role of radula in molluscs?

What is the role of radula in molluscs?

What is the role of radula in molluscs ?

What are epithelial tissues? What is their function and how is that function associated with the features of the tissue?

Except endocrine function, what are other functions of placenta?