Cnidarians are an example of organisms that possess a simple type of what system, used for sensing touch?

• Correct Answer: bacterial system
• circulatory system
• lymphatic system
• nervous system

Explanation: Cnidarians have a simple nervous system. It consists of a net of nerves that can sense touch. You can see a sketch of the nerve net in a hydra in Figure below . Some cnidarians also have other sensory structures. For example, jellyfish have light-sensing structures and gravity-sensing structures.

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