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In biology cohesion is the molecular attraction when a molecule is dispersed evenly throughout a mass.. This happens in trees, water is a cohesive substance (due to its polar properties) that is absorbed through the roots of a plant and are dispersed evenly throughout the plant. If the water runs out, then the whole plant does not have enough water to all their cells and he is going to die (or not grow). I'm pretty sure that this quality is applied in the plasma of the blood, so it is very important to us and all other animals.