2. Heather and Matthew walk with an average velocity of +0.87 m/s eastward. If it takes them 27 minutes to walk to the store, what is their
displacement? (include direction)
(5 points)

and 1and 1

a displacement distance is size of displ

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 =