Liz and Justin both look for the luster of the same mineral. Liz examines the samples under the reading light in her bedroom, while Justin takes his sample and a flashlight into a dark room. What statement best explains why the two got different results? None of Liz's samples had luster. Liz's light was too bright to see luster. They used different procedures to test for luster. Justin wore glasses that helped him see more details.

this isn't the answer but they're the graphs

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 =

80cm/s.

24cm/s.

53.3cm/s.