Explanation:
Positive Feedback Loop
The direction is maintained, not changed, so this is positive feedback. Another example of positive feedback is uterine contractions during childbirth. The hormone oxytocin, made by the endocrine system, stimulates the contraction of the uterus. This produces pain sensed by the nervous system.
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<span>it has to be in living organisms, it has to have a plasma membrane and it has to arise from a previously existing cell.</span>
Solar radiation, because it hasn't (at least noticeably) affected hawks.
