Yes, they use a gas exchange (oxygen in and carbon dioxide out) taking place by diffusion across cell membranes of the tube feet.
Any animal need oxygen for respiration.
No. Sea urchins live in the sea.
More sea urchins.
The classification of a Sea Urchin is Echinoidea
there are excatly 3million purple sea urchins
sea urchins eat kelp.
Echinoderms.
in the sea
No. Sea urchins are primary consumers and only eat sea weed, algae and kelp.
Yes, sea urchins are herbivores because they mainly feed on algae.
Sea urchins are found generally in the sea, however they can also be found in/on rock pools or areas near to the sea.
Sea urchins reproduce by releasing eggs and sperm into the water, where external fertilization takes place. Once fertilized, the eggs develop into larvae that eventually settle and grow into adult sea urchins. Some species of sea urchins can also reproduce by asexual means, such as splitting or budding.