Water vascular system is the characteristic of which group of the following:
(a) Porifera (b) Ctenophora (c) Echinodermata (d) Chordata

Explanation

To determine which group has a water vascular system, we can follow these steps:

1. **Understand the Water Vascular System**: The water vascular system is a unique feature that is primarily associated with certain groups of animals. It is a network of fluid-filled canals that is used for various functions, including locomotion, feeding, and respiration.

2. **Analyze the Options**:
- **(a) Porifera**: This group includes sponges, which do not have a water vascular system. They have a simple body structure and rely on water flow through their bodies for feeding and respiration.
- **(b) Ctenophora**: Also known as comb jellies, they do not possess a water vascular system. They have a different method of locomotion using cilia.
- **(c) Echinodermata**: This group includes starfish, sea urchins, and sea cucumbers. They are known for having a water vascular system that aids in movement, feeding, and respiration.
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