Exercise 1.26 A 5.0 lb box of grass seed will seed 2500 ft2 of
lawn. = Express this coverage in m^2/kg

K= m^2/kg

If football was tossed in air without gravity or friction the ball would go into space

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.

If your workout exceeds an hour you should substitute "a sports drink" for water.hope my answer has you : )

Carbon dioxide because it consists of one type of molecule.