Samira throws a volleyball horizontally off the roof of her house, which is 24 meters high. How long does it take to hit the ground?

the answer is a. hope this .

it's a b and

total distance/total time

(85 + 82)/(5+3)

167/8

20 just over

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 =