A wooden crate is pulled with F, 2F and 3F forces, as shown in the figure. Compare the magnitudes of the frictional forces, since they do
not move in three cases.

technology is the application of the knowledge gained by science.

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 =