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They poke you if you touch them.
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.
A sea urchin is a half-sphere. The top of the urchin is rounded like a globe but the bottom is flattish to fit on the bottom of the sea so it can walk around.
The echidna of Australia and New Guinea, the hedgehog of Britain, the porcupine.
A (street) urchin is a child who lives on the street, surviving by engaging in petty crimes. A (sea) urchin is a spiny creature (exoskeleton), with a soft interior. I welcome improvements to this answer.
Sea Urchin
Sea Urchin
They look like a normal eye except the white in a sea urchin is blue and have bright yellow eye coloring.
The classification of a Sea Urchin is Echinoidea
A salt-water body. Like a SEA or ocean. It says in the name SEA urchin.
No. The sea cucumber is, in fact, an echinoderm like the sea urchin.
A Sea urchin