An important aspect of fission reactions is that they produce which allow for chain reactions. the picture shown shows a practical application of

An important aspect of fission reactions is that they produce free neutrons,  which causes chain reactions.

a sonic boom is a loud boom that breaks the sound barrier

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 =