The answer is concentration gradient. Have a good day.
The answer to this is C because humans don't have cell walls and if you are looking at an onion it has a cell wall because it is a plant.
<span>CPT code stands for Current Procedural Terminology. Medical providers use specific codes to report the procedure and/or services performed on a patient. This allows the insurers to know how much to reimburse the provider. The CPT code for this particular situation would be 88173.</span>
Erosion breaks rocks apart.
Hope This Helps You!
Good Luck Studying :)