Question

Do sea anemones have a nervous system?

Answer 1

Invertebrates are hardly "simple animals," but they are masters of economy: despite having far less nerve cells than even the tiniest vertebrates, they solve all of the same survival issues, can exist in highly structured communities, and can convey sophisticated signals. Sea anemones are also an example of invertebrates belonging to the phylum Cnidaria or Coelenterata.

Complete answer:
Yes, Sea anemones have a nervous system.
The phylum Coelenterata or Cnidaria includes sea anemones, sometimes known as Adamsia. They have a diffuse nervous system, which is made up of nerve nets that are spread throughout the body.
The nerve net serves as a sensory location in the cnidarian body; neuron cells stretch all over the animal's body and allow it to detect chemical changes, catch prey, and move in reaction to a stimulus. A diffuse nerve net is another name for this type of expanding neural net.
Other radially symmetric creatures, such as sea stars, have a radial, or circular, nerve net which is quite different from the diffuse nerve net of cnidarians. Nerve nets in cnidarians are occasionally grouped together to form ganglia. These bundles, while not real brains, act as a link between sensory neurons that interpret environmental information and other sections of the cnidarian body.

Note:
Sea anemones are soft-bodied, mostly stationary sea creatures that resemble flowers and belong to the invertebrate order Actiniaria (class Anthozoa, phylum Cnidaria). They may be found in all seas from the tidal zone to depths of more than $10,000$ metres (about $33,000$ feet). Some animals can only survive in brackish water. In warmer oceans, they are the biggest, most abundant, and most colorful.