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Coelenterata is old term , now this phyllum is divided in two different phylla i.e. Cnidaria and Acnidaria .

distinguishing characters of colenterata were

1 : presence of coelenteron

2 : presence of stinging cells

3 ; presence of tentacles .

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A Hydraform wall is a wall that is built using the Hydraform building blocks. Hydraform blocks are interlocking building blocks that is produced using a Hydraform block machine. Hydraform block machines utilises compressed earth method in creating building blocks, soil and cement is mixed and then compressed using the machine to manufacture high quality stabilised building blocks. Blocks are intelocking and require up to 70% less mortar than conventional bricks or blocks.

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it displays radial symmetry but somone needs to answer how does a hydra display radial symmetry. pleze

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sea anemones, hydra, corals, jelly fish

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No, it's an echinoderm.

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One adaptation of a cnidarian is the ability to regrow an entire body part. They also use stinging tentacles to catch prey. Jellyfish are cnidarians.
Adaptations? Stinging tentacles (cnidoblasts) - pronounced nie-doe-blasts - sensitivity to light, pulsing motility, life cycle stages that take advantage of protected and food rich environments.

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It is not a single cell. It if a fully developed animal. It's a very cool one at that. It has stinging cells and tentacles with which it catches its prey. It can swim around or attach itself to something and stay there. It swallows its prey whole. Since it has only two layers of cells if you have one you can see through it and watch its prey being digested. How cool is that?

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No, notochord is only present in the chordates phylum. The only kind of support cnidaria possess is a hydrostatic skeleton like in most soft-bodied animals.

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An animal that exists in a mudusa or poylp state.

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A cnidarian is defined by the root of its name, cnida, which is Greek for stinging nettle. All cnidarians, therefore, have cnidocytes, which are the stinging, adhering, or entangling cells that allow them to eat, defend, or move. It is diploblastic (two layered) and generally they are radially symmetric. Cnidarians are also exclusively aquatic.

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budding external

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Phylum Cnidaria

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The Hydra

The Hydra was a water serpent with nine heads and very poisonous acidic breath. One Head was Immortal. For Hercules' second Labor, he had to kill this beast. Unfortunately, every time he cut off one of the Hydra's heads, two more grew in its place. Hercules overcame this by dipping his sword in the venom of one of the severed heads so that every time he cut a head off, none could grow back. Hera (who hated Hercules) was mad at this so she sent a giant crab to help the Hydra. Hercules crushed it underneath one of his large feet. Finally he cut the immortal head off and (because it was still alive) put it under a rock on the sacred way from Lerna to Elaius. Hera put the crab in the sky as the constellation Cancer so it wouldn't be forgotten.

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18 is the stars of the constellation hydra

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The Hydra has radial symmetry

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there is no function. asians use them for their tentacle porn though.

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In the GastroVascular Cavity

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Crabs,sea urchins,isopods,amphipods,plankton,and small fish basically whatever they can catch.

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Cnidereans have pressure-sensitive poison glands called nematocysts that are usually on their tentacles. When their [prey] touches these nematocysts, small "fangs" inject poison into the [prey]. The poison in the nematocysts can paralyze or even kill small animals. Once the prey is subdued, the tentacles pull the prey towards the mouth.

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In present time, hydra-headed evils refer to the different aspects that can occur from a problem that's difficult. In Greek Mythology a Hydra-headed evil is a seven-headed monster that Hercules kills in Lake Lerna. When he tried to cut off one of its head another immediately grew back in its place.

mythology owns!

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This is a trick question. Because hydras are only two cell layers thick, they do not have a true circulatory system. The inner cell layer absorbs materials directly from their gastrovascular cavity. So a hydra doesn't have blood!

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yes sea anemone is a living animal

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If your talking about the fresh water hydra, then it is a few millimeters tall and is best examined using a microscope