No energy is used [High] [Low] (it’s the natural flow)
No energy is used [High] [Low] (it’s the natural flow) This means it goes down a concentration gradient.
![No energy is used [High] [Low] (it’s the natural flow)](https://static.fdocuments.us/doc/330x215/56812df1550346895d9351fb/no-energy-is-used-high-low-its-the-natural-flow.jpg)
![No energy is used [High] [Low] (it’s the natural flow) This means it goes down a concentration gradient.](https://static.fdocuments.us/doc/330x215/56649edf5503460f94befe19/no-energy-is-used-high-low-its-the-natural-flow-this-means-it.jpg)
