Ok, the basic problem you have is that you get confused between what a foot is and what a suction cup is.

Lets take the 5 pointed starfish, each 5 points is a foot. on one foot there is lots of suction cups.

but the answer to the question is, yes but they have more than one they have 1 million+ between 5 feet in a 5 pointed starfishes case

A starfish as an average of 36 chromosomes.

No. they are coelomic

yes, but only sea cucumber

Sand dollars.

The snail can protect itself by, when threatened, retracting into its shell and therefore hiding beneath their protective shell.

Four examples of echinoderm animals are: 1. Sea Stars 2. Sea Urchins 3. Sand Dollars 4. Sea Lilies

Most humans know the Echinoderms rather from the unpleasant side: if one finds oneself near the coast, on a rocky shore or reef, one must beware the prick of a sea urchin. The fine structure of the spines of certain species of sea urchins means that if the spine pierces the flesh, it may break off when an attempt is made to remove it. It may require patience - or the physician - to fully remove the remaining piece of spine. However in the kitchens of some countries, echinoderms are regarded as a delicacy; and for children sea-urchin skeletons are as popular a collecting object as brightly coloured starfish are fascinating. The economic impact of Echinoderms is primarily local. Around 50,000 tons of sea urchins are captured each year, the gonads of which are consumed particularly in Japan, Peru and in France. The taste is described as soft and melting, like a mix of seafood and fruit. The quality depends on the color, which can range from light yellow to bright orange. Sea cucumbers are also considered a delicacy in some countries of south east Asia; particularly popular are the pineapple roller Thelenota ananas (susuhan) and the red Halodeima edulis. They are well known as bêche de mer or Trepang in China and Indonesia. The sea cucumbers are dried, and the potentially poisonous entrails removed. The strong poisons of the sea cucumbers are often psychoactive, but their effects are not well studied. It does appear that some sea cucumber toxins restrain the growth rate of tumour cells, which has sparked interest from cancer researchers. The calcareous tests or shells of echinoderms are used as a source of lime by farmers in areas where limestone is unavailable; indeed 4,000 tons of the animals are used annually for this purpose. This trade is often carried out in conjunction with shellfish farmers, for whom the starfish pose a major irritation by eating their stocks.

the body covering of a coenlenterate is a soft flexible substance ... i don't know if it is correct ... hihi... :D

The maximum age is around 100-130 years sorry couldn't find anything more specific =(

They belong to the phylum: Marine animals.

Have radial symmetry, a mesodermal skeleton and they all have a water vascular system called: ambulacral.

A echinoderm can obtain resources because if you think about it, The sea urchin etc. they all filter feed that is how they get their food.

prokaryotic

Almost all starfish are non-poisonous. The exception that comes to mind is the Crown of Thorns starfish, that carries a toxic charge on its spines. However, it's painful to even pick up, much less eat. I think you're okay on this one.

Echinoderms are protected by their spiny skins, but are still preyed upon by some types of shells, fish, crabs, shrimps, among many other.

-Karli Hicks

Sea urchins, class Echinoidea

Yes, several. Most crinoids are sessile and live their life attached to underwater rocks, as do several starfish species.

No. Porifera (sponges) are heterotrophs. This is a key defining feature of all animals.

Some do but not all.

Yes

Eventually echinoderms do live in water.

well you see my good chum

a feather star is located in the middle of the Arabian desert while the "sea lilly" being derived from the british botonist CPHAT yeaman , is a derogatory name for the common house cat.