What is the biggest disadvantage of using nuclear power to produce electricity? A. Nuclear fission releases more air pollution than burning coal.
B. Nuclear fission produces less energy than burning coal or oil.
C. Nuclear waste must be safely stored for many years.
D. Nuclear waste must be incinerated.

C

Explanation:

Nuclear waste must be safely stored for many years because it is bad to store that much nuclear waste.

i think its c if i'm wrong

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 =