An object at a temperature of 3° kelvin emits thermal radiation. what region of the electromagnetic spectrum would the peak of this emission fall in?

The longer "far-infrared" waves

Explanation:

The longer "far-infrared" waves are closer to the microwave section on the electromagnetic spectrum, and can be felt as intense heat, such as the heat from sunlight or fire

seeing the graph would

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 =