Answer:
Sea anemones and jellyfish look very different, yet they are both related. Corals are also a close cousin. They all belong to a group called cnidarians , because they have stinging tentacles. ... the medusa or jellyfish phase, where they are free swimming.
Step-by-step explanation:
Describe the main difference between a coral colony and a hydroid colony. ... Unlike sea anemones, which live alone or in small groups, coral polyps live in large groups as colonial animals, attached to one another by a thin membrane.