. Which of the following best describes dark matter? (1 point) It's an area that has become too concentrated with stars.
O These are large clumps of galaxies.
O It is very large and invisible,
O Dark matter can only be detected using light beams.

it is very large and invisible

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 =