If a kid on a skateboard grabs onto the back of a car to go faster, what kind of relationship is this?
mutualistic
commensalistic
parasitic
both b & c

as technology advances, new experiments often expose problems in accepted theories. c

hope i

-lavira: )

c. magnitude and direction

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 =