Which of the following statements best explains the processes of passive and active transport?
Passive transport is the net movement of substances down a concentration gradient that requires metabolic energy. Active transport is the movement of substances up a concentration gradient that does not require energy.

Passive transport is the net movement of substances down a concentration gradient that does not require metabolic energy. Active transport is the movement of substances against a concentration gradient that requires energy.

Passive transport is the net movement of substances against a concentration gradient that requires metabolic energy. Active transport is the movement of substances down a concentration gradient that does not require metabolic energy.

Passive transport is the net movement of substances against a concentration gradient that does not require metabolic energy. Active transport is the movement of substances down a concentration gradient that requires energy.