Scientists spot an asteroid hurdling towards Earth with an average speed of 2.44 x 10^4 mph. If the asteroid is presently 16.7 million miles away, how long until it collides with Earth, assuming its speed remains approximately constant? Report your answer in days. (1 day = 24 hours).

whichever one it is, it's definitely not one that you included on the list you provided.

object 2 because all the other ones are wrong

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 =