Which of the following statements are observations about the photo on the right? Check all that apply. Three boys are wearing gr
een shirts. Most of the children are running. The boy in yellow is going to kick the ball. The grass is green. The boy on the far right is playing defense.
Answer: "To move substances against a concentration or electrochemical gradient, a cell must use energy. Active transport mechanisms do just this, expending energy (often in the form of ATP) to maintain the right concentrations of ions and molecules in living cells."
