We know, too, that the instincts are the great releasers of energy. [Please select]
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If the tips were present in all members of the two species, it could be postulated, in line with recent investigational work by Tinbergen (1947), that the tips are in the nature of species "releasers," facilitating species recognition. [Please select]
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The great releasers of energy are the instincts. [Please select]
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