Answer:
change
Step-by-step explanation:
a concentration gradient can be described in 2 ways:
with the concentration gradient: is often described as the solutes move from a high cont. to a low cont. ( also known as passive transport, doesn't require ATP ( energy ) ).
againt the concentration gradient: is described as the solutes move from a low conct. to a high cont. ( this is also called active transport and requires ATP ( energy ) to do so ).