Answer:
A surface wave is a wave that moves along the interface of two different materials, like air and water.
Explanation:
Univalves are one shell or shell having one piece
bivalves contain two shells
Despite their frequency in the intertidal zone, in tide pools, sea urchins can be found at many different depths and in any habitats. They can also be found in nearly any ocean temperature. Sea urchins inhabit the polar seas as well as the warm tropics.
After receiving a stimus, the sensory receptors send(s) signals to the appropriate area of the body.
the must be sensory neurons.
hope its help..
--erjayU
