9) Why do you suppose the error for the lead was so much larger than the other two materials? 10) Did any questions come up while performing this lab? If so, state them here.

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 =

false.

explanation:

this statement is false. after falling for 5 seconds, its speed will not be 100 m/s.