Which object has the most thermal energy? O A. A 4 kg brick at 20°C
O B. A 4 kg brick at 25°C
O C. A 2 kg brick at 20°C
O D. A 2 kg brick at 25°C

3.2x10^7

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 =