| http://www.w3.org/ns/prov#value | - But in neither case is there any definite indication of a true impulse, i.e. an impulse determined by sensation, toward the food-stuff, or of any sort of psychological middle term between stimulus and movement.[4] The same thing holds of the movements of the lower forms of algae, fungi and swarm-spores, produced by a variable distribution of water and carbon dioxide, or by different kinds of light
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