The distribution of charge on an object depends on whether the object is made of a conductor or an Insulator. This is because conductors and Insulators differ in what characteristics?
A) The mass per unit volume they exhibit,
B) How well they allow magnetism to flow
C) How well they allow electrons to flow
D) How easily they can be shaped

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 =