In Rutherford's experiment, which of the following proved that the nucleus of an atom has a positive charge?
a The nucleus was found to have protons
b
The alpha particles were found to be
attracted to the nucleus
с
The alpha particles, being positively charged,
were deflected by the nucleus
d All of the above

b) the alpha particles were found to be attracted to the nucleus

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 =