Here are 5 characteristics of Hydra, based on the provided reference:
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Appearance: Hydras resemble tiny, delicate, elongated sea anemones.
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Body Structure: They have a columnar or trunklike body, which is structurally a bag.
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Mouth: The mouth is located at the top of the body.
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Tentacles: The mouth is rimmed with several long tentacles.
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Cell Layers: Hydra bodies are only two cell layers thick.
