Because the molecules that are being transported is moving against its concentration gradient. in other words, its moving from where its low in concentration to where its high in concentration
Peeing in a cup is required for a drug test
One good reason would be that they could give someone, or many people who are in desperate need of a new organ, a second chance at life.
If a student rests and then squeezes a clothespin for one minute, will they be able to squeeze it more than someone that exercised before squeezing the pin for 1 minute?
Hope this helps!
