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There are two common definitions of urchins. An urchin may be a sea urchin, a small prickly animal or to a street urchin or homeless child living on the street.

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14y ago

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What is the unique features of a sea urchin?

Sea Urchins have spikes are soft and chalk like , or they can be , hard and covered by a shell-like structure . There are more than 200 types of Sea Urchins , there are many different sizes and shapes of Sea Urchins species.


How many kinds of sea urchins are there?

200 types


How many types of sea urchins?

Sea star or starfish (Asteroidea)Brittle stars, basket stars, serpent stars (Ophiuroidea)Sea urchins, heart urchins and sanddollars (Echinoidea)Holothurians or sea cucumbers (Holothuroidea)Feather stars and sea lilies (Crinoidea).


What are five species of phylum echinodermata?

You are probably looking for the different TYPES of echinoderms, they are listed below. * Sea Star (starfish they are also called) * Brittle stars * Sea Urchins * Sea Cucumbers * Sand Dollars


What are examplres of consumers in the ocean?

Well there are a couple of types like the sea turtle, they eat kelp. So do sea urchins.


Are there any other types of echinoderms other than sea urchins and sea stars?

Yes, there are also sea cucumbers and crinoids.


How are sea anemone and a sea urchin different?

sea anemones have stinging tentacles, and sea urchins have spines.


How much mass do sea urchins have?

You can't really answer this question because sea urchins have different masses depending on their size. For example, a small sea urchin will have a smaller mass than a big sea urchin.


What does the process of fertilization in sea urchins produce?

More sea urchins.


Do sea urchins live in Connecticut?

No. Sea urchins live in the sea.


What are the three types of germ layers that form tissues and organs in sea urchins?

the three germ layers on a squid are the ectoderm, endoderm and mesoderm


Compare and contrast the support systems of cicadas and sea urchins?

Well, honey, cicadas and sea urchins both have support systems, but they're as different as night and day. Cicadas rely on their exoskeleton for structure and protection, while sea urchins have an endoskeleton made of calcium carbonate plates. So, in a nutshell, cicadas wear their support on the outside, while sea urchins keep it all on the inside.