Find the odd one among the following:

Spiders and scorpions are:

Which are the excretory organs in members of phylum Platyhelminthes?

An example of phylum Echinodermata is:

What is the scientific name of the National bird of India?

The body cavity of arthropoda is:

A group of freely inter-breeding organisms constitutes a:

Organisms that feed upon decaying matter are called:

Mesoglea is a characteristic of:

Elasmobranchs do not have: