A 1200 kg car traveling 3.0 m/s to the north runs into a telephone pole. The telephone pole completely stops the car. Which of the following is true?
A. Momentum is not conserved because outside forces act on the
system
B. The momentum of the telephone pole after the collision is 3600
kg•m/s to the north.
C. The momentum of the telephone pole after the collision is 3600
kg m/s to the south.
D. The total momentum before the collision equals the total
momentum after the collision.

the results is a decrease in air temperature with an increase of altitude.

explanation:

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 =