3. (1) An electron acquires 5.25 x 10-65 of kinetic energy when it is accelerated by an electric field from plate A to
plate B. What is the potential difference between the plates,
and which plate is at the higher potential?

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 =