2. A package is dropped from a plane traveling at a constant horizontal velocity. If the plane maintains its course, where will the package land with respect to the plane overhead?
D - Behind the plane
E- Under the plane
F- In front of the plane

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 =