What are facts about echinoderms?

Answer 1

Echinoderms are made up of starfish, sea cucumbers, brittle stars, sea urchins, etc.

Echinoderms are organisms in the phylum Echinodermata, which is Latin for "spiny-skinned."

Echinoderms have radial symmetry, which means that you can divide them into sections with a central point like spokes on a wheel (ex. divide them into eight equal sections), and each section would be the same. To better understand this, see the question "What is radial symmetry?"

Echinoderms live in the ocean.

Echinoderms don't have hearts or brains.

Echinoderms have tube feet, which are similar to suction cups. The tube feet stick on to surfaces or prey.

This answer is more relevant than the previous one, which stated "I'll put the answer later. Here's an interesting poem: Fleas

Adam

Had 'Em"
we learned about that in science
we learned about that in science

Answer 2

cnidarains are animals

Actually, they are a type of phylum, which is an invertebrate.

Facts-

They produce sexually and asexually. Their body is shaped as a vase- Polyp or upside down bowl- Medusa
they don't have a brains.
they do not have brains

there are two body forms-

polyp- cant move, vase shaped example is hydra

medusa-move, bell shaped, example is jellyfish

Answer 3

This phylum, containing over 9,000 species of animals found exclusively in aquatic environments is distinguished by the existence of cnidocytes, specialized cells that they use mainly for capturing prey. Their bodies consist of mesoglea, a non-living jelly-like substance, sandwiched between two layers of epithelium that are mostly one cell thick.

They have two basic body forms: swimming medusae and sessile polyps, both of which are radially symmetrical with mouths surrounded by tentacles that bear cnidocytes. Both forms have a single orifice and body cavity that are used for digestion and respiration. Many cnidarian species produce colonies that are single organisms composed of medusa-like or polyp-like zooids, or both. Cnidarians' activities are coordinated by a decentralized nerve net and simple receptors. All cnidarians reproduce sexually. Many have complex lifecycles with asexual polyp stages and sexual medusae, but some omit either the polyp or the medusa stage.


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Answer 4

Cnidaria are some of the simplest and most beautiful "animals." These creatures are flower-like and resemble plants in many respects. However, they have a mouth and a simple digestive system at the center of their tentacles. Because of these two features, these creatures are considered animals and not plants. There are 9000 species of Cnidaria.

Cnidarians are simple, radially symmetrical, animals. Radial symmetry means that the body is a hub, like a bicycle wheel, and tentacles are spokes coming out of it.

The Cnidarians include the hydroids, jellyfish, anemones, and corals. All Cnidarians use tentacles which have stinging cells which are used to subdue and capture food. The word "Cnidarian" means "stinging creature" in Latin (an old language that is still used in identifying animals). A stinger can be set off when a tentacle touches something. The stinger contains a toxin which disables prey. Most Cnidarians stingers are not powerful enough to do any harm to people. However, some jellyfish can deliver very painful, and sometimes fatal, stings to people.

Cnidarians can have one of two basic shapes: polypoid or medusoid.

Written by Abigail McGuire - Age 12

Answer 5

Four classes make up the phylum Cnidaria:

• Anthozoa, which includes sea anemones and coral
• Cubozoa, which includes Portuguese man-of-war
• Hydrozoa, which includes jellyfish
• Scyphozoa, which includes box jellies

There are about 9,000 species of cnidarians. Cnidarians live in aquatic environments and inhabit all depths, from the sandy substrated up to the surface. They can be found from the Great Barrier Reef off the coast of Australia to the contiental shelves of the Arctic Ocean.

Interesting fact: Cnidarian bodies have only one open that serves as both mouth and anus. Chnidarian have no brain or a heart.

Answer 6

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