All classes of fishes possess a composed of fluid-filled canals arranged along the sides of the body, which permit them to detect movement and vibrations in the water.

Factors which influence vegetation. There are four major factors which influence the nature and growth of vegetation. These are: climate, soils, nature of the surface, and man. Light intensity influences the manufacture of plant food, stem length, leaf color and flowering. Generally speaking, plants grown in low light tend to be spindly with light green leaves. A similar plant grown in very bright light tends to be shorter, better branches, and have larger, dark green leaves.

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