The Cnidaria phylum
The Cnidaria phylum is made up of jellyfishes, sea fans, sea anemones, hydras and corals. The Cnidaria phylum is made up of aquatic, soft-bodied and carnivorous animals. Cnidarians have stinging tentacles in a ring around their mouths. Only some have skeletal systems, but they are the simplest animals to have body symmetry and specialized tissues. It may not look like it, but the tentacles on these species is one of its muscles.
Sea Anemones
the sea anemones have two types of muscle fiber. Observation of the muscle in both resting and contracted states has shown that the two types do not result from differences in contraction state of the muscle. The fine structural characteristics distinguishing A and B fibers are similar to those which distinguish fast and slow muscle fibers in higher animals. The distribution of A and B fibers in Stomphia and Aiptasia is consistent with the distribution of fast and slow muscles in these two species.
Corals
A coelenterate has an outer skeleton, if it has one. It moves by waving its body and tentacles. The body basically consists of two layers with a jellylike middle. Coral are very simple and are stationary with there wy to produce food through sunlight or through tiny plankton flowing threw them.
Jellyfish
Jellyfish only have one muscle and that is the tentacle. jellyfish do not have a brain or anyway to do anything. Jellyfish seem to just wander in the drift of the sea and absorb things that get caught in their tentacles. they can controlling moving up and down at will though through shooting water or absorbing it to sink. Jellyfish can live forever if they are not killed by an outside source.