The range of wavelengths present in the different types of electromagnetic radiation is called the electromagnetic spectrum. The electromagnetic spectrum is illustrated in the diagram provided. Different portions are labeled. Which portion has the longest wavelengths?

 C is the answer

Explanation:

the answer is 12 as i may remember

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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 =