How long would it take a message sent as radio waves from earth to reach mars when farthest from earth (401 million km apart)?

The radio waves travel at speed of light:


The distance of Mars from Earth when it is at the farthest point is:


And since the motion of the radio waves is a uniform motion, we can use the basic relationship between velocity, space and time to find the time the waves take to reach Mars:

The independent variable would be the fertilizer as it is what the dependent variable (the growth of grass) depends on.

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.