EVERYDAY SCIENCE

Detailed explanation-1: -Cubozoans have medusae commonly known as box jellyfish, from their shape.

Detailed explanation-2: -The cnidarian body consists of a central blind sac, the gastrovascular cavity, enclosed by a body wall of two layers, the outer epidermis and the inner gastrodermis, with a gelatinous connective tissue layer (the mesoglea) between the two layers.

Detailed explanation-3: -Some have no polyp stages and some (e.g. hydra) have no medusae. In some species, the medusae remain attached to the polyp and are responsible for sexual reproduction; in extreme cases these reproductive zooids may not look much like medusae.

Detailed explanation-4: -There are two basic cnidarian body shapes: a polyp form, which is attached to a surface; and an upside-down free-floating form called a medusa. Some cnidarians change form at different phases of their life cycle, while others remain in one form for their entire life.