In this sense, visiting a plant to measure herbivory may alter herbivory rates, biasing results (Cahill et al., 2001). Recently, this principle was extended to ecology, namely to the interactions between plants and herbivores (Cahill et al., 2001). If this in fact occurs, then the way that a physicist understands a problem and how conclusions are drawn from his or her study are affected (Heisenberg, 1927). Introduction In 1927, the German physicist Werner Heisenberg introduced the "Uncertainty Principle", according to which the act of measuring the physical properties of a particle alters its behaviour that is, locating it in a small region of space makes the momentum of the particle uncertain, whereas measuring precisely its momentum makes the position uncertain (Heisenberg, 1927).
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