What is an analogy for active transport and passive transport?

Explanation:

Active transport occurs when a solute must pass through the cell membrane against its concentration gradient. A good analogy is that this is like pushing the water that fell over a waterfall, back up the river to the falls above.

some of your causes might be acidic rain or natural wildfires that cause the parks to be degraded

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when you breathe in, or inhale, your diaphragm contracts (tightens) and moves downward. this increases the space in your chest cavity, into which your lungs expand. the intercostal muscles between your ribs also enlarge the chest cavity. they contract to pull your rib cage both upward and outward when you inhale.