Why might coal be considered a more efficient source of energy than biomass? (1) Coal is a more concentrated energy source (2) Coal is nonpolluting. (3) Biomass grows very slowly (4) Biomass is only available in windy areas. I

it is given that trillions of microbes make up to 1% to 3% of the body mass.

let's take average of this percentage: 2%

consider the average mass of the human body as 70 kg.

then, trillions of microbes would have mass  

therefore, 100 trillion micro-organisms would weigh:

this is an approximate value and could change depending on the mass of the human body and percentage of the microbes present in it.

average mass per microorganism =

the ima (higher than 1m) will be greater than the ima with the height of 1m.

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explanation: