The work done is 137 joules.
Lifting opposes the acceleration of gravity, which is 9.8 m/sec/sec.
20 x 0.7 x 9.8 = 137 J (kg-m2/sec2)
Photosynthesis, ocean absorption, and fossilization are carbon sinks. Combustion and respiration are carbon sources
The correct answer is A) DNA
