Class-9-Science

Diversity in Living Organisms-Theory Session-19

There is a brief description of basic characteristic features of organisms that belong to phylum arthropoda and mollusca in this session.

Diversity in Living Organisms-Theory Session-20

There is a brief description of basic characteristic features of organisms that belong to phylum echinodermata in this session. Also there is a brief comparison of organisms that belong to phylum arthropoda, mollusca and echinodermata.

Diversity in Living Organisms-Theory Session-21

This session briefly describes the basic properties of organisms that belong to phylum chordate and its sub-classification.