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4 "[...] when Kennel claimed that one can build a phylogenetic tree between any given pair of organisms or species, Uexküll saw in this a play and not serious science. Instead of zoology, he started to be interested in physiology (particularly of marine invertebrates), investigating how physiological mechanisms work in the natural conditions of living nature. He also moved away from the views of Ch. Darwin and E. Haeckel" (Kull, 2004: 105).