Please help!! What does a straight line slanting up from left to right on a distance versus time graph show?

Average time
Average distance
Constant speed
Changing speed

Please answer!

The correct answer is it shows a constant speed. The value of the constant speed is equal to the gradient (slope) of the line.

The answer is water molecules are split.cellular respiration and photosynthesis are complement  reactions to each other. these are reverse reactions. in cellular respiration glucose and oxygen yield water and carbon dioxide. so, when respiration begins,  glucose molecules are split. in the opposite reaction - in photosynthesis, carbon dioxide and water yield glucose and oxygen. thus,  when respiration begins, water molecules are split.