I think the answer is D. A good indicator is the resting heart rate. Exercise strengthen your heart and it makes it more efficient. The resting heart rate shows of the heart is pumping blood normally each time it contracts. Having a normal resting heart rate would mean a healthy heart.
Minerals would be a reasonable explanation to this scenario
My opinion is on Minerals
Answer=Minerals
Answer: Transport proteins act as doors to the cell, helping certain molecules pass back and forth across the plasma membrane, which surrounds every living cell. In passive transport molecules move from an area of high concentration to an area of low concentration.
That would be the tuber, which is formed from a root or stem of a plant.
D. Increases, then remains the same
As seen on the graph, the amount of photosynthesis rises and then maintains in a straight line, meaning it is staying the same. Hope that helps!!