Echinoderms possess a unique water vascular or ambulacral ( appendages such as " tube feet ") system.

* A true endoskeleton ( that is, protective tissue derived from mesoderm ) is also present in Echinoderms.

Other studies indicate that these subcuticular bacteria may be both abundant within their hosts and widely distributed among the Echinoderms in general.

Echinoderms ( Phylum Echinodermata ) are a phylum of marine animals.

Echinoderms are found at every ocean depth, from the intertidal zone to the abyssal zone.

Echinoderms are also the largest phylum that has no freshwater or terrestrial ( land-based ) representatives.

Echinoderms evolved from animals with bilateral symmetry.

Echinoderms have a mesodermal skeleton composed of calcareous plates or ossicles.

Echinoderms exhibit a wide range of colours.

Echinoderms also have a haemal system, and often also a perihaemal system.

Echinoderms lack specialized excretory ( waste disposal ) organs and so nitrogenous waste, chiefly in the form of ammonia diffuses out through the respiratory surfaces.

Echinoderms become sexually mature after approximately two to three years, depending on the species and the environmental conditions.

Echinoderms are globally distributed in almost all depths, latitudes and environments in the ocean.

Echinoderms provide a key ecological role in ecosystems.

Echinoderms are not as frequently harvested for food as molluscs and crustaceans, however sea urchin roe is quite popular in many parts of the world.

Echinoderms typically possess an internal skeleton composed of plates of calcium carbonate.

Echinoderms ( such as the starfish ), crayfish, many reptiles, and amphibians exhibit remarkable examples of tissue regeneration.

Echinoderms, such as sea stars and sea urchins, and mollusks, including squid and clams, as well as many other species are also at risk because of thinning shells and weakened skeletal structures.

Desor afterwards became professor of geology at the academy of Neuchâtel, continued his studies on the structure of glaciers, but gave special attention to the study of Jurassic Echinoderms.

Those three other great activities of the Persians, the bath, the teahouse, and the zur khaneh ( the latter a kind of club in which a leader and a group of men in an octagonal pit move through a rite of calisthenics, dance, chanted poetry, and music ), do not take place in buildings to which entrance tickets are sold, but some of them occupy splendid examples of Persian domestic architecture: long, domed, chalk-white rooms with daises of turquoise tile, their end walls cut through to the orchards and the sky by open arches.

He closes his `` letter '' by demanding that Dunkirk be demolished, that the Pretender be forced to move farther away from the coast of England, and that the Queen and the House of Hanover come to a better understanding.

In cooperating toward that objective, OAS might move with the speed and effectiveness demonstrated by the United States.

The move for establishment of a national seashore park on 30,000 acres of Cape Cod, from Provincetown to Chatham, is strengthened by President Kennedy's interest in that area.

Suggest the following twenty-first-century amendment: By moving the term `` Republic '' to lower case, substituting the modern phrase, `` move ahead '' for the stodgy `` keep '', and by using the Postmaster's name on every envelope ( in caps, of course, with the `` in spite '' as faded as possible ), the slogan cannot fail.

Now, driving the horse and sulky borrowed from Mynheer Schuyler, he felt as if every bone was topped by burning oil and that every muscle was ready to dissolve into jelly and leave his big body helpless and unable to move.

He refused to bring Claire to it even as an occasional visitor, claiming that his every move was watched by spies of the Milbankes.

I didn't want to touch him and I hoped Ma would do it but she kept looking at the kid's clothes piled on the floor and the pool of water by them and didn't make any move to.

Quite naturally, they make the investigation, first, by prohibiting the patient from making any movements at all and then, later, by repeating it and allowing the patient to move in any way he wanted to.

The area may also be provided with additional data during the running of the object program by means of EDMOV or move macro-instructions.

The Selkirk settlers had been anticipated in their move southward by British fur traders.

Accordingly Selkirk's agents ordered the settlers to move north, and by October, John Halkett had torn down both posts, floating the timber to `` the Forks '' in rafts.

Mr. Simpkins will move into the post being vacated by Thomas B. Finan, earlier named Attorney General to succeed C. Ferdinand Sybert, who will be elevated to an associate judgeship on the Maryland Court of Appeals.

Analysts saw the move as a continuation of the recovery drive that got under way late Monday afternoon when the list sank to a hoped-for `` support level '' represented by around 675 in the Dow Jones industrial average.

Sailing activity is slowed down by Texas northers, but power cruisers can move freely, poking into the San Jacinto, Trinity and Brazos rivers ( fine tarpon fishing in the Brazos ) or pushing eastward to the pirate country of Barataria.

" Historian Donald described the speech as a " superb political move for an unannounced candidate, to appear in one rival's ( William H. Seward ) own state at an event sponsored by the second rival's ( Salmon P. Chase ) loyalists, while not mentioning either by name during its delivery.

On the surface of the ground or in water they move by undulating their body from side to side.

In frogs, the hind legs are larger than the fore legs, especially so in those species that principally move by jumping or swimming.

In 1932, soon after the prediction of positrons by Paul Dirac, Carl D. Anderson found that cosmic-ray collisions produced these particles in a cloud chamber — a particle detector in which moving electrons ( or positrons ) leave behind trails as they move through the gas.

* 1863 – American Civil War: The Siege of Vicksburg – ships led by Union Admiral David Dixon Porter move through heavy Confederate artillery fire on approach to Vicksburg, Mississippi.

In addition to this, the land the Ainu lived on was distributed to the Wajin who had decided to move to Hokkaido, who had been encouraged by the Japanese government of the Meiji era to take advantage of the island ’ s abundance of natural resources, and to create and maintain farms in the model of western industrial agriculture.

They refused the offer by Russian officials to move to new reservations in the Commander Islands.

This dominating move by Agesilaus earned the respect of his men-at-arms and of Lysander himself, who remained emotionally close with Agesilaus.