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These organisms are very simpleand they do not require a circulatory system. Since their body wall is very thin, they are surrounded by water. Substnces can easily diffuse in and out of the body. Their simple structure helps them in circulation.

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How would you describe the difference in responsiveness between hydra and sponges?

Hydras typically exhibit faster responsiveness compared to sponges due to their ability to move and capture prey with their tentacles. Sponges, on the other hand, have a more limited response as they rely on water flow to filter feed and lack the ability to actively move to capture prey.


The absorption and circulation of materials in a hydra are most similar to the absorption and circulation of materials in a?

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Which animals does not have nervous system?

Sponges do not have a nervous system. They are simple aquatic animals that lack organs and have a decentralized network of cells for coordinating their activities.


What are organisms that use budding?

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