Which of the following is a vector quantity?

a. 12 l of water
b. 100 kg of flour
c. 85 m/s on freeways
d. 55 mph to the south

explanation:

considering the bohr theory, the type of connection that requires the transfer the answer conuldn't be right

not too sure thinking all accelerations are pointed down

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 =