Metagenesis refers to:

Step-by-step solution

Body forms: Two basic body forms are found in cnidarians which differ in structure and function from one another. These are called polyp and medusa. A polyp is a cylindrical form that remains attached to the substratum (hence sessile) whereas a medusa is an umbrella-shaped and free-swimming form. Some cnidarians exist only in polyp form, e.g., Hydra, Adamsia , while some have medusa as the dominant form in their life cycle (polyp may be reduced or absent), e.g., Aurelia (jellyfish). Some other cnidarians exist in b