The body size of a living creature has a direct impact on its fitness—from the simplest animal and plant organisms right up to human beings. The individual size or height is therefore an important criterion for the ability of an organism to succeed in the competition for resources or reproduction. We basically assume that there is similar genetic information within a species, which in theory should lead to relatively uniform body sizes. However, within specific physiological limits, the individuals of most species grow to very different sizes—thus size must also be dependent on other factors. .
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Source: Phys.org