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Select all of the characteristics of common hydras. - They exist in a medusa stage only. - They are...

Select all of the characteristics of common hydras.
- They exist in a medusa stage only.
- They are solitary polyps.
- Their mouth is on oral end surrounded by hollow tentacles.
- They attach to substratum by pedal disc.
- They live in freshwater habitats, such as clean pools and streams.

Answer

  1. They exist in a medusa stage only. - False. Hydras do not have a medusa stage; they are polyps.

  2. They are solitary polyps. - True. Hydras are solitary and do not form colonies.

  3. Their mouth is on oral end surrounded by hollow tentacles. - True. Hydras have a mouth surrounded by tentacles.

  4. They attach to substratum by pedal disc. - True. Hydras use a pedal disc to attach to surfaces.

  5. They live in freshwater habitats, such as clean pools and streams. - True. Hydras are found in freshwater environments.

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