What is the gravitational force between a 45 kg person, and the Earth at 5.98 x 1024 kg, with a distance of
6.38 x 106 m?
 Object 1 (m1): 45 kg person
 Object 2 (m2): 5.98 x 1024 kg Earth
 Distance: (r): 6.38 x 106 meters
A. 227 N
B. 398 N
C. 441 N
D. 510 N

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.

Answermake them get very hot and over time wear them out;