Why do living organisms contain more hydrogen atom than any other atom

oxygen atoms contain 16 times more mass than hydrogen atoms.

hydrogen has only 1 proton and no neutrons so it has an atomic number and mass of  1

oxygen has 8 protons and 8 neutrons so the atomic number would be 8 and the mass would be 16

it takes 16 hydrogen atoms to make one oxygen atom

1. (1.2kw)x(15/60hours) = .3kwh --> a

2. (5kw)x(90/60hours)x(8cents/kwh) = $0.60 --> d

3. microwave --> 1200 watts = (1.2kw)x(6/60hours) = .12kwh

coffee-maker --> 900 watts = (.9kw)x(10/60hours) = .15kwh

therefore, it requires more energy for the coffee-maker to do the same amount of work.

so the answer is a.