What is the meaning? confederation

A confederation is a union of sovereign states, united for purposes of common action often in relation to other states.

Explanation:

Confederalism represents a main form of inter-governmentalism, this being defined as any form of interaction between states which takes place on the basis of sovereign independence or government.

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 =