Signs marking may indicate requirements associated with them and the hours when those requirements apply.

B. HOV lanes    (not gore areas or toll booths, if those are the two other choices)

higher potential

explanation:

because it is in a high speed so it must move into a of high potential

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 =