EVERYDAY SCIENCE

Detailed explanation-1: -Cnidarian cells exchange oxygen and carbon dioxide by diffusion between cells in the epidermis with water in the environment, and between cells in the gastrodermis with water in the gastrovascular cavity.

Detailed explanation-2: -Cnidarians lack organs. This means that they do not have respiratory or circulatory systems. Like the cells in sponges, the cells in cnidarians get oxygen directly from the water surrounding them.

Detailed explanation-3: -And in Cnidarians, the diffusion of gases occurs in the gastrovascular cavity which is called the coelenteron. During this process, oxygen in the surrounding environment diffuses through the ‘skin’ of the Cnidarian, moving from the outside of the animal to the inside.

Detailed explanation-4: -While cnidarians do not have lungs or other respiratory organs, they do use body cells to take in oxygen and expel waste gases.

Detailed explanation-5: -Like the sponges, Cnidarian cells exchange oxygen, carbon dioxide, and nitrogenous wastes by diffusion between cells in the epidermis and gastrodermis with water.