Facilitated Diffusion: Only Statement 1 is Correct

Steps:

• Recall facilitated diffusion is passive transport via proteins down a concentration gradient without energy.
• Evaluate statement 1: It correctly describes no ATP use, aligning with passive nature.
• Evaluate statement 2: It incorrectly implies active transport features like energy input.
• Evaluate statement 3: It wrongly suggests movement against gradients, which requires active transport.

Why C is correct:

• C selects "1 only," matching the definition of facilitated diffusion as passive and gradient-driven per cell biology principles.

Why the others are wrong:

• A includes 2 and 3, which misstate passive vs. active transport.
• B includes 3, confusing it with active transport laws.
• D excludes 1 but includes incorrect 2 and 3.

Not enough information on exact statements, but based on standard biology.

Final answer: C