Which is a form of active transport?
a)proteins enter and exit the cell freely.
b)proteins create openings on another side of the cell membrane.
c)proteins open up channels in the cell membrane.
d)proteins push molecules through the cell membrane.

D)Proteins push molecules through the cell membrane.


An active transport is the process by which a substance is transported or transferred from one area to another using a chemical energy in the course. 

As oppose to passive transport, active transport’s key to its description uses energy to be able to transfer the said substance. This is important in a lot of aspects such as providing the needed elements or compounds in cellular activity.

Iwould say overuse ( but not 100% sure ) in the u.s. we tend to overuse water by leaving it running, throwing it away, taking long showers, etc.