Can you compare the sponges, cnidaria and the cnenophores?
Sponges: are stationary, or sessile, once the spore finds a hard substrate to settle on. They are passive feeders and are usually found in shallow water habitats where the flow of water, or current, pretty consistant. In feeding, food particles in the water is captured by specific cells in the sponge as the water flows through the sponge, entering through ostia or incurrent pores on the sides and enter the atrium (big cavity) and exit through the osculum or large opening at the top. Don’t know if you need a more detailed description. Cnidaria: Is a very large group that included sessile and free-swimming; and include jellyfish, coral, sea anenome and more. While there are some that are fresh water, most are marine and inhabit shallow water, and sessile forms can be found on rocky coasts or coral formations in tropical waters. Two forms are generally found: the sessile polyp and the free swimming medusa stage. In hydras, the body stalk and tentacles can extend, contract, or bend to one
