Ais a device that multiplies force or increases speed and makes work easier.

the independent variable, or the one that is intentionally manipulated is the speed.

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 =

answer a fan shaped mass of sediment deposited at the base of a mountain front do to an abrupt change in stream gradient;