Earth's average orbital velocity is about 6.7 times faster than that of the planetoid Makemake. Rounded to the nearest whole number, Makemake's orbit is about [ANSWER] times larger than Earth's orbit

the answer is to check all of them! they all apply well at least i think so!

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 =