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flow down the gradient requires NO energy; flow up the gradient REQUIRES energy (up/down a hill)
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pressure gradient
blood flow from heart or air flow into the lungs (straw)
concentration gradient
water flows from an area of high chemical concentration (tea bag in hot water)
electrical gradient
+charged ions will move to area of relative negativity (batteries)
thermal gradient
heat will flow to a cooler area (cold hands and a hot cup of coffee)