1, the sea anemone is a coelacanth, a very simple structure of the animal, it does not even have the lowest brain base, but the sea anemone is poisonous.

2, jellyfish is a kind of cavernous mollusk living in the sea, edible, widely spread in the sea of north and south China, for food and medicine.

3, jellyfish is a low-level marine invertebrate zooplankton, coelenterata, jellyfish body is the main component of water, its body water content generally up to more than ninety-five percent.

4, coral polyps are a kind of coelenterata in the ocean, prey on the ocean's tiny plankton for food, absorb calcium and carbon dioxide in seawater, and then secretion of limestone, into their own shells.

Extended information:

Main features of coelenterates

1. The body is radial symmetry, some are bi-radial symmetry?

2, two germ layers and a primitive digestive cavity?

3, Cells show primitive tissue differentiation?

4, reticular nervous system (diffuse or diffuse nervous system)

5, characteristic spiny cells?

6, sexual and asexual reproduction, with alternation of generations, and a floating wave larval stage in marine species

Baidu Encyclopedia - Cnidaria