Analysis of cohesion in a science text

How a fish finds its way

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All fish have one sense for which we have no parallel. Down their flanks and branching over the head, runs a line with slightly different texture from the rest of the body. It consists of a number of pores, connected by a canal running just below the surface. This lateral line system enables the fish to detect differences of pressure in the water. As it swims, a fish creates a pressure wave that travels ahead of it. When this meets some other object, the fish by means of its lateral line can detect the change.

Source: The Trials of Life. Attenborough, D. 1992. HarperCollins.

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