What is the difference between Specific heat capacity and Heat capacity and why are they used for?

Specific heat is the amount of heat energy required by a unit of mass of a substance to raise its temperature through 1°c or 1k. On the other hand, heat capacity is the amount of heat energy required by a substance to raise its temperature by 1°c or 1 k.Specific heat is not dependent on the mass of the substance on the other hand heat capacity is dependent on the mass of the substance.

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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 =