Tama, Jason, and Sia wanted to determine how much energy was needed to heat water. To cut down on multiple trials, they all decided to use
different masses of water but heat them all by 10°C, Tame found the energy
needed to heat 10 g of water was M18 J, Jason found the energy needed 10
heat 30 g of water was 1254 J. Sie found the energy needed to heat 20 g
of water was 836 J

i think the answer is b

well clustered together.

points close on a scatter diagram

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 =