Here is a question from the text aids: What happened the night before? O A. Catherine wrote a laundry list for Northanger Abbey. OB. A severe storm made Catherine shudder in fear as she was unable to sleep. Oc. C. Catherine found papers she thought were old and mysterious.

d

explanation:

i think the answer is d. but im not sure!

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 =