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Skepticism is good.
Right, a brain/nervous system would be along there on the scale and would even be considered a threshold for most thinkers these days, I imagine.
As for myself, I'm interested in pushing beyond that threshold and considering the phenomena of tropisms exhibited by all life forms as signs of intelligence. The imposition of behavioristic interpretations of living systems has systematically blinded us to even investigating aspects of consciousness until recently. And that is the main impediment, IMO.
Investigating and speculating on the nature of self-preservational impuses (tropisms) in plant and animal species seems to me to be an excellent path to pursue here. A tropism may be seen as an "intelligent" response to environmental and internal necessity.
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create evolution
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