Select the true statements about alpha particles.

A. Alpha particle formation is accompanied by the conversion of a neutron into a proton.
B. Alpha particles have a mass number of 4.
C. Alpha particle formation is accompanied by the conversion of a proton into a neutron.
D. Alpha particles have a nuclear charge of 1.

anchor = archer //

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 =