Compare and contrast the different part of the electromagnetic spectrum. Evaluate the usefulness of each part and decide which part is most useful, or most important, to you and society as a whole.

Gamma rays can be used in the treatment of cancers. X-rays are used in diagnostic imaging to find pathology. The ultraviolet rays are typically thought of as dangerous to the skin, but we also need a certain amount of them to help activate D3 for calcium absorption, visible light is by far the most useful to society making it to where we are able to see, infrared can be used in short range activation of technologies like a remote control and and night vision etc, and radio waves may be the next most useful thing to society because we are able to communicate with them.

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 =