What type of energy is stored in a stretched spring!? A. kinetic energy
B. rest mass energy
C. elastic potential energy
D. chemical potential energy
E. gravitational potential energy

c. elasti potential energy

Explanation:

i have learned it

Umm Prolly C, elastic potential energy :)

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 =