Which of these could most likely be used to indentify a person?

low freq = 100 mhz

low wavelength =101.7m

length = 3x10^8/freq

falling water hydro = water .. spectcular places these plants are

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 =