posted by Kiki .
Could someone explain what concentration gradient is? My book doesn't give a definition, and the definitions on the web that I've found don't explain it very well.
Thank you for using the Jiskha Homework Help Forum. Since you don't state the definitions you found, possibly this will help you:
3. (part II): http://www.biology-online.org/biology-forum/about179.html
4. (Broken Link Removed)