Question

passive transport
all of the following are characteristics of passive transport except:
substances move downhill, from high to low concentration, and require energy expenditure.
no energy expenditure is required.
substances move from high to low concentration.
substances move down a concentration gradient.

Explanation:

Passive transport is the movement of substances from an area of high concentration to an area of low concentration (down - concentration gradient) without the use of energy. The option stating that substances move downhill from high to low concentration and require energy expenditure is incorrect as energy is not needed in passive transport.

Answer:

Substances move downhill, from high to low concentration, and require energy expenditure.