The whole point of scaling in general and allometry in particular is to understand the effect of changes in size on the construction of organisms. Going back to Galileo and D'Arcy Thompson, there are problems which are imposed by increased size when one considers that weight goes up as the cube of the linear dimensions and strength as the square. And there are all those interesting physiological matters which stem from the fact that, like weight, metabolism is related to the cube of the linear dimensions, while the diffusion of food and the exchange of gases, such as oxygen and carbon dioxide, is a square function dependent on the surface area of the individual.
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