The modern atomic model states that electrons move sort of like a. a swarm of bees around a bee hive. b. really fast runners going around a track. c. lots of people jammed up and moving around on a dance floor. d. football players all moving in on the ball carrier to make a tackle.

50 inches should be the resultant vector

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 =