In $Hydra$,undigested food and nitrogenous waste products are removed through:

  • A
    Mouth and Mouth
  • B
    Body wall and Body wall
  • C
    Mouth and Body wall
  • D
    Mouth and Tentacles

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Which pair of cells is present in the epidermis of Hydra but not in its endoderm?

It is a common cavity that performs both digestive and circulatory functions.

The larva-like stage of $Hydra$ is known as:

In which phylum are the animals characterized by cells arranged in two embryonic layers?

In $Hydra$,waste materials after digestion and nitrogenous waste materials are removed from

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