Questions: Why doesn't facilitated diffusion require energy from the cell? The movement is from a high concentration to a lower concentration The protein channels provide the energy required. Facilitated diffusion does require energy.

The answer is the first one: The movement is from a high concentration to a lower concentration.

Explanation for each option:

1. The movement is from a high concentration to a lower concentration: This is correct. Facilitated diffusion is a type of passive transport, which means it does not require energy from the cell. It relies on the natural movement of molecules from an area of higher concentration to an area of lower concentration, following the concentration gradient.

2. The protein channels provide the energy required: This is incorrect. Protein channels facilitate the movement of molecules across the cell membrane but do not provide energy. They simply provide a pathway for molecules to pass through, allowing them to move down their concentration gradient without the use of cellular energy.

3. Facilitated diffusion does require energy: This is incorrect. Facilitated diffusion is a passive process and does not require energy. It differs from active transport, which does require energy to move substances against their concentration gradient.

In summary, facilitated diffusion does not require energy because it involves the movement of molecules from an area of high concentration to an area of low concentration, utilizing protein channels to assist in the process without expending cellular energy.