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(If observed behavioural changes in an organism result in) a marked increase in chances of survival for many situations, then (the organism) is intelligent.
Does this seem like a fair test (of intelligence)?
If it is, then it would mean that entities like collaborating bacterial colonies are actually intelligent. Every bacteria follows some basic chemical signalling rules, and the behavior of the group as a whole adapts to never before seen circumstances. What we call a brain in higher organisms, is also of course a collection of multiple single cells called neurons, communicating with each other using chemical neurotransmitters and actual physical pathways and junctions, all working in conjunction to enhance the survival of the containing body.