Echinoderms

a woodchuck could chuck as much wood as a woodchuck could if a woodchuck could chuck wood.

No you are a mini Beast

The 5 living classes of echinoderms are Asteroidea (sea stars) Crinoidea (sea lillies) Echinoidea (sea urchins and sand dollars) Holothuroidea (sea cucumbers) Ophiuroidea (brittle stars and basket stars)

the same type as blue footed underwater donkeys.

ctenophorains(jellysfish) are spherical in shape much like a ball hence show radial symmetry. echinoderms(starfish) generally are flatter and have 5 arms hence are called pentaradial symmetry (can be cut in only 5 directions)

Some jellyfish prefer the cold waters. While other types of jellyfish love the warm waters. The jellyfish prefer to live in groups together. The can live in oceans and also freshwater.

For the sea star, they grap a clam with all five arms, then it pulls on the tightly closed shell with its tube feet. When the shell opens, the sea star forces its stomach out through its mouth and into the opening between the clam's shells. And then the digestive chemicals break down the clam's tissues, and the star sucks in the partially digested body of its prey.

Castes

No. Sponges belong to the phylum Porifera, which means 'pore bearing.' The have pores that are called incurrent vents, where water comes in, and excurrent vents, where water goes out. They are considered the most primitive of animals because they don't have any complex organs or tissues, so, for example, they don't have a circulatory system or a digestive system or a nervous system. Their cells are somewhat loosely structured in that some cells can move around from place to place in the sponge and there are some unspecialized cells that can become other kinds of cells. Also, they only have two layers of cells. There are some types of sponges that you can put through a sieve to separate all the cells but then the cells will go back together to recreate a sponge again.

Echinoderms are a completely different and more advanced phylum. They have organ systems and fixed (non-changing) cell types and more layers of cells. Also, if you put an echinoderm through a sieve, he's a gonner.

Here is an example in sea stars. Water enters into the body of the sea star though a plate on the top. The water rushes through the body and down each of it's tentacles. The moving water fuels the hydraulic system of its tube feet. Because of the water entering it's body, its muscles can move its feet and allow movement for the whole sea star. The same is true with most echinoderms.

The general process is called regeneration. Some species of starfish reproduce by fission using regeneration to make each half into a full and separate organism.

Echinoderms, such as starfish, have basal nerve ganglia that serve as a nervous system. They also have a water vascular system that acts as a circulatory system. They can reproduce, move, and digest food. Therefore, they are animals.

The health of the echinoderm influences growth speed.

They don't. They are invertebrates that live on the ocean floor. They have tube feet that they use to shuffle along the sea floor. Sea urchins are echinoderms, but they don't have tube feet. They walk on their spines.

They are radially symmetrical, there is no cephalization ( no heads ) and they are, like you deuterostomes. ( indeterminate cleavage and a mouth that does not arise from the blasophore ).

Also, they are all marine animals and they have spiny skin.

Echinoderms eat a variety of sea life. Depending on the type of echinoderm dictates its diet. Many eat snails, sea urchins, barnacles, mussels and clams. They use their feet to suck open a shell such as a clam, and then put their stomachs over the opening to suck out their meal.(:

Glad i Could Help .

Echinoderms are characterized by radial symmetry, several arms (5 or more, mostly grouped 2 left - 1 middle - 2 right) radiating from a central body (= pentamerous). The body actually consists of five equal segments, each containing a duplicate set of various internal organs. They have no heart, brain, nor eyes, but some brittle stars seem to have light sensitive parts on their arms. Their mouth is situated on the underside and their anus on top (except feather stars, sea cucumbers and some urchins).

Echinoderms have tentacle-like structures called tube feet with suction pads situated at their extremities. These tube feet are hydraulically controlled by a remarkable vascular system. This system supplies water through canals of small muscular tubes to the tube feet (= ambulacral feet). As the tube feet press against a moving object, water is withdrawn from them, resulting in a suction effect. When water returns to the canals, suction is released. The resulting locomotion is generally very slow.

There's actually 8 "types"(which i consider classes) of echinoderms we know today, 2 of them are extincted, the 2 extincted ones are homalozoa and helicoplacoidea. The 6 living today are crinoidea(includes sea lilies)asteroidea(which includes star fishes)ophiuroidea(which includes brittle stars) echinoidea (which includes sea urchin)holothuroidea(which includes sea cucumber, which i like to call sea pickles) and last and least, concentricycloidea(which includes sea dasies, the reason they're least is because there's only 2 species of them known so far). If you're talking about sub-phylums of echinoderms, i believe there are 2 of them, i have no idea what the 2 extincted ones go in to, but i think scienctists only classify species that's not dead, the 2 subphylum are pelmatozoa(which includes only crinoidea) and there's eleutherozoa(which includes all of the classes except homalazoa, heli and crinoidea)

it really depens on the animal. Some will cmofloge

It depends what type of starfish you are talking about and whether it is in its own environment or introduced. If it is in its natural environment, it would eat and be eaten, but if it is an introduced species (e.g. Northern Pacific sea star) it may not have any predators and be competing for food with the native wildlife.

sea lilies

The free-swimming larvae can travel much greater distances than the bottom-dwelling adults, increasing their range. If the environmental conditions for the adults become bad, the larvae can travel to another area that may be more favorable.

there are many uses of echinoderms. and i can site some. they can be harvested as food, esp. the holothurians, we also use them as decorations, echinoderms esp. sea urchin are also recently studied in the laboratories bec. biologists believe that they may be of help in discovering medicines for human diseases.