You. : ) describe passive transport using the words concentration and concentration gradient.

Hey there Rayan!

To start off this, one things to take to mind, each transports (concentration) are very different. They both travel at different speed's. For concentration gradient not require the expenditure of cellular energy for this process. This would indicate that the speed on this concentration would be alot slower and also  concentration gradient have smaller walls.

Hope this helps you!
~Jay

Cotton was the very first