Wilbur ran 1-kilometer. Then he ran 500 meters. How many meters did Wilbur run all together? A) 15,000
B) 1,500
C) 1000
D) 150

the answer is d. 4

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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 =