Answer:
D
During respiration in humans oxygen is used then h20 abd co2 is released which photosynthesis uses for build up
If the student has mass 75 kg, and if the stairs are 3 m high, then
<span>work = mgh = 75kg * 9.8m/s² * 3m = 2200 J </span>
<span>so I'd say "one one-hundredth." </span>
<span>Except that I think 5000 cal ≈ 20.95 kJ (not J), and that would change my answer to </span>
<span>"ten times or so".
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