Shore Crabs survive wave action by their shells and their strong claws. When a wave is coming they use their claws to the sand to get grip so the wave won't pull them away, they use their shells in case a rock or something hard in the waves come their way
Cell wall: strong; supporting layer around the cell membrane in plant cells
Nerves are cells that can detect any type of pressure, movement, or anything of that nature. If we didn't have nerves, we couldn't feel pain. If the nerves in a foot are damaged, you wouldn't feel the pain of it being burned.
So in order to form a new organism, two gametes -- the sex cells, sperm and egg -- must fuse, further mixing the genes to produce more genetic diversity. Asexual reproduction is one organism dividing into two organisms without shuffling its genes, so the offspring has the same version of genes as did the parent.
