A marble rolls horizontally off a table that is 0.80 m tall. If the marble lands 0.60 m from the base of the table, at what speed did the marble
leave the table?

answer: a. same unit

explanation:

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 =

answer( sicar );