To lift this 2000 N weight to a height of 1 meter by hand, a mover did 2000 joules of work. Assuming the pulleys are frictionless, how much work does he do when using this block-
and-tackle device?

are there options? cause you ain’t. real specific

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 =