Where is the sun rays strike earth most directly and least directly

The sun rays strike earth most directly at the equator and that's due to the Earth angle of rotation, that makes it possible for the sun to hit most directly at the equate.

The sun rays strike earth least directly at the poles and that's also due to the Earth angle of rotation., that's why the poles are colder than the equator.

i'm thinking more like energy

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 =