Question 1 of 10 Which question cannot be answered through making measurements?
O A. Should humans stop using chemicals that harm honeybees?
B. How does a decline in honeybees affect the pollination of crops?
C. Which chemicals produced by humans cause harm to honeybees?
O D. How much has the honeybee population declined in North
America?

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 =