Question

Explain two main characters of Phylum echinodermata.

Answer 1

Phylum Echinodermata includes sea creatures like star fish, sea urchins, brittle stars, sea cucumbers. The characteristic features of it includes:

1. Adults have radial symmetry whereas larvae have bilateral symmetry.

2. They have no heart, brain, no eyes.

3. They have tube feet with suction pads attached at the extremities.

4. They have water vascular system.

5. They have no excretory system.

6. They show external fertilization.