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The classification of a Sea Urchin is Echinoidea
sea urchin
A sea urchin does move, but not very frequently.
A stimulus is an external event that triggers a response in an organism. A response is the reaction or behavior that an organism exhibits as a result of a stimulus. In short, a stimulus is the input, while a response is the output.
because the crab needs the sea urchin for protection and the sea urchin needs the crab for food
An organism reacts to a stimulus with a response.
Ummm...it's the thing from which a sea urchin hatches?
I think a sea anenome and a sea urchin can live together because i have a little aquarium and there is a sea urchin and and a sea anenome (if that's how you spell it) living in there and they were perfectly fine. BUT if you have a sea urchin do not have any crabs in there, because my sea urchin killed one, and almost killed another one by taking its claw off. :(
A response.
The reaction to a stimulus is called a response. An intensified stimulus usually evokes a more intense response. Of course the type of response to a stimulus depends on the nature of the stimulus. Scream at someone and they likely will feel verbally attacked. The screaming is the stimulus, feeling attacked is the response.
No, stimulus is the cause and response is the effect. In feeding an animal, giving it food is the stimulus and it eating the food is the response.
a blue tuxedo sea urchin