Explain why the aurora borealis, or northern lights, can
be seen at the North Pole but not at the equator.

(On edge)

Explanation:

Sample response: When charged particles from the Sun enter Earth's magnetosphere, the positive ions and negative ions create a ring current that is opposite Earth's magnetic field. This current reduces Earth's magnetic field especially at the poles. When the charged particles enter Earth's atmosphere at the poles, they collide with other atoms at high-altitude areas and produce the aurora borealis, or northern lights.

car a and b are moving in opposite directions

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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 =