● `color{Brown}"Members"`: Members of this phylum are commonly known as `color{Violet}"Coelenterates"` (as they have a central gastrovascular cavity) or `color{Violet}"Cnidarians"` ( due to the presence of cnidocytes, which contain the stinging cells.)

● `color{Brown}"Habitat"` : They are all `color{Violet}"sessile"` or free-swimming aquatic organisms. They are mostly marine and a few are freshwater forms too.

● `color{Brown}"Symmetry"` : Mostly `color{Violet}"radially symmetrical"`.

● `color{Brown}"Level of Organisation"` : They show tissue level of organisation and are `color{Violet}"diploblastic"`.

● `color{Brown}"Examples"` : 𝘗𝘩𝘺𝘴𝘢𝘭𝘪𝘢 (Portuguese man-of-war), 𝘈𝘥𝘢𝘮𝘴𝘪𝘢 (Sea anemone), 𝘗𝘦𝘯𝘯𝘢𝘵𝘶𝘭𝘢 (Sea-pen), 𝘎𝘰𝘳𝘨𝘰𝘯𝘪𝘢 (Sea-fan) and 𝘔𝘦𝘢𝘯𝘥𝘳𝘪𝘯𝘢 (Brain coral).

● Body consist of `color{Violet}"cnidoblasts"` or `color{Violet}"cnidocytes"` (containing the `color{Violet}"stinging capsules or nematocytes"` ) present on the tentacles and the body.

● Cnidoblasts are used for anchorage, defense and for the capture of prey.

● They have a central `color{Violet}"gastro-vascular cavity"` with a single opening, `color{Violet}"hypostome"`.

● `color{Brown}"Digestion"`: Digestion is extracellular and intracellular.

● `color{Brown}"Skeleton"`: Some of the cnidarians, e.g., `color{Violet}"corals"` have a skeleton composed of `color{Violet}"calcium carbonate"`.

● Cnidarians exhibit two basic body forms called `color{Violet}"polyp and medusa"` .

● `color{Brown}"Polyp"` : It is a sessile and `color{Violet}"cylindrical"` form like 𝘏𝘺𝘥𝘳𝘢, 𝘈𝘥𝘢𝘮𝘴𝘪𝘢, etc.

● `color{Brown}"Medusa"` : It is an `color{Violet}"umbrella-shaped"` and free-swimming like 𝘈𝘶𝘳𝘦𝘭𝘪𝘢 or jelly fish.

● `color{Brown}"Both Forms"` : Those cnidarians which exist in both forms exhibit `color{Violet}"alternation of generation"` ( `color{Violet}"Metagenesis"` ), i.e., polyps produce medusae asexually and medusae form the polyps sexually (e.g., 𝘖𝘣𝘦𝘭𝘪𝘢).

● `color{Brown}"Members"`: Members of this phylum are commonly commonly known as `color{Violet}"sea walnuts or comb jellies"`.

● `color{Brown}"Habitat"`: They are exclusively marine

● `color{Brown}"Symmetry"`: Mostly `color{Violet}"radially symmetrical"`.

● `color{Brown}"Level of Organisation"` : They show tissue level of organisation and are `color{Violet}"diploblastic".

● `color{Brown}"Examples"`: 𝘗𝘭𝘦𝘶𝘳𝘰𝘣𝘳𝘢𝘤𝘩𝘪𝘢 and 𝘊𝘵𝘦𝘯𝘰𝘱𝘭𝘢𝘯𝘢

● The body bears eight external rows of `color{Violet}"ciliated comb plates"` , which help in locomotion.

● `color{Brown}"Digestion"` : It is both extracellular and intracellular.

● `color{Violet}"Bioluminescence"` is well-marked in ctenophores.

● `color{Brown}"Sexes"`: Sexes are not separate (`color{Violet}"hermaphrodite"` ),i.e., eggs and sperms are produced by the same individual.

● `color{Brown}"Mode of Reproduction"` : Reproduction takes place only by sexual means.

● `color{Brown}"Development"` : Fertilisation is `color{Violet}"external"` with `color{Violet}"indirect"` development.