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Message: <blockquote data-quote="Okie4570" data-source="post: 4073331" data-attributes="member: 15643"><p>It's "real" to humans, but nothing else, they don't know what it is, they just respond to temps. If it's hot they find shade or become inactive, etc. Plants close their stoma based on heat and moisture lost. They don't delay life necessities or change plans or put off obligations based on the wind or humidity like humans do. Mechanical, thermostat opens and closed based on temperature, fan clutch same thing.</p></blockquote><p></p>