What indicates that an area in the Northern Hemisphere is experiencing summer? The Sun is at its lowest point in the sky. The Sun is directly over Earth’s north end. The Northern Hemisphere receives fewer direct rays from the Sun. The northern end of Earth’s axis is tilted away from the Sun.

probably not if net force is zero

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 =