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Sea Urchins
There are over 900 sea urchin species and they can be found in almost all parts of any ocean. They are often characterized by protruding spines from their test.
260 Questions
Is sea urchin bioluminescent creature?
yes an angler fis is a bioluminescent animal this is because all jelly fish are biolumenscent animals...........................................................................yes an angler fis is a bioluminescent animal this is because all jelly fish are biolumenscent animals...........................................................................
Is the sea urchin in the lower intertidal zone?
The zone sea urchins live in is nothing. They don't live in the ocean. Sea urchins live high up in trees. Their diet consists of elifunts and tiygurs. They are eetun by ants and spiydurs. Also sea urchins can fly. And they have x-ray vishun and freez breth. They also have jiunt manshuns and like to punch thing with thayr soopur strong fists. Also they are imurtel which means they can't die... evur. These are truly fasinateng kreechirs.
When do sea urchins communicate?
they do not make sounds or noises but they send out chemicals and they only communicate when they are mating
Do sea urchins have an open circulatory system?
All vertebrate animals (animals with spines) and a few invertebrates
("echinoderms" - starfish, sand dollars, sea urchins, and sea
cucumbers) have closed circulatory systems.
What two ways spines are useful adaptation for sea urchins?
What symbiotic relationship does a sea urchin have?
The symbiotic relationship is commensalism because the tiny fish gets a place to hide while the sea urchin is unaffected.
How long can sea urchins live out of water?
"When kids say 'average' they are really getting themselves into trouble! Most sea urchins are mass spawners, producing several million eggs. If even a tiny percentage are fertilized, you will have thousands of live offspring. And only a small percentage of these survive in their planktonic form without starving or being eaten until they find a place to settle as tiny adult urchins. Of these, only a handful will survive to spawn (and perhaps none). If I were being mathematically and linguistically correct I would have to answer your question, "The *average* lifespan of an urchin is 10-12 days!"
On the west coast the intertidal sea urchins that kids come in contact with, like purple sea urchins (Strongylocentrotus purpuratus), are thought to be able live as long as thirty years. " - (author:Henrik Kibak)
shared by: Glen Corral
yes they do.
http://www.enchantedlearning.com/subjects/invertebrates/echinoderm/Seaurchin.shtml
How do sea urchins get oxygen?
Yes, they use a gas exchange (oxygen in and carbon dioxide out) taking place by diffusion across cell membranes of the tube feet.
What type of symmetry do sea urchins have?
Seahorses are fish; therefore, like all vertebrates, they have bilateral symmetry. This means they have symmetry across one plane (known as the sagittal plane, and directly down the centre of their body), which means one side of their body approximately mirrors the other side.
How does a sea urchin feel like?
a sea sponge,well it depends what kind of sea sponge.a soft sea sponge can feel like wet pasta.a hard but squishable sea sponge will feel lumpyer.
What are Sea urchins physical adaptations?
-They produce a large amount of gametes
-They synchronize spawning so there are both sperm and eggs present at the same time
-Males usually spawn upstream so sperm gets carried to eggs
-Eggs adhere to the spines of the female urchin to keep them from floating away to make it easier for sperm to reach them
Nope. They are nekton because they actively swim and catch their food.
no, mammals are grouped together because they all posses hair, lungs and mammary glands (hence the name) to produce milk, and a few other features. the urchin does not posses any of these quality's and therefore is not a mammal
What is the most dangerous sea urchin?
The most dangerous fish in the ocean is the piranha.
The piranha is a freshwater fish for Christ's sake!
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There's no such thing as one "most dangerous fish."
In venomous fish, the stonefish stands above all. Its spines pack a poison that can kill a human who steps on it, and the thing looks like a rock so you're likely to.
In predatory fish, there are a lot of contenders but I'll have to go with the shortfin mako shark, which is a seriously predatory animal.
Those are both marine animals. In freshwater fish, I give the nod not to the piranha--a fish not considered the most dangerous even in the Amazon River basin where it lives (people there consider the candiru, a catfish known for lodging itself in people's urethras, the most dangerous fish in the Amazon) but to one of two pangasiid catfish, the Paroon shark (p. sanitwongsei) or the Mekong catfish (p. gigas). These are huge fish--the Paroon shark grows to 10 feet in length and the Mekong catfish is larger--that are renowned for eating dogs and for tearing the guts out of fishermen with the spines in their pectoral fins.
Sea urchins eat very slowly but like many other animals, they eat on a daily basis. A sea urchin's diet consists of things like algae and seaweed. If this food is not available, they will eat things like dead animals and sponges.
