The project is timed- i have like an hour left- Once you have drafted and revised your business letter, upload it here. Your letter should clearly explain where your information comes from, how you have planned, and how you will implement your plan.

layer a is the exosphere and layer b is the thermosphere.   is the answer i think but i hope this .

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 =