The answer is C. Amount of water because a constant variable is a variable that stays the same and the amount of water is constant throughout the experiment
Again, What Brainlys said, D.
It’s answer c!! i just took that and i got it right
Answer: Diffusion occurs due to the random movement of particles. It usually happens due to a concentration gradient, meaning that molecules move from an area of high concentration to an area of lower concentration.
Explanation: