1. Polyp: This is a sessile form, meaning it is attached to a surface and does not move freely. Polyps are typically cylindrical or tubular in shape, with a mouth surrounded by tentacles. Examples include sea anemones, corals, and hydras.
2. Medusa: This is a free-swimming form, shaped like a bell or umbrella, with tentacles hanging down from the underside. Examples include jellyfish and box jellyfish.
Therefore, the answer to your question depends on the cnidarian species being observed.
* If the transparency shows a sessile, cylindrical or tubular form with tentacles, the dominant stage is the polyp.
* If the transparency shows a free-swimming, bell-shaped form with tentacles, the dominant stage is the medusa.
It's important to note that some cnidarian species alternate between the polyp and medusa stages during their life cycle.
