Kara built a model of how molecules behave when they are in solid form. she filled a clear plastic box with marbles to the very top and put the lid on the box. when she shakes the box, the marbles can barely move. which of the following is a limitation of kara's model?

The marbles must be held in a box, but solids hold together without a container.

Explanation:

study island!!!

the entire statement is true and correct.  

there's no diagram, nothing is illustrated, and no question is asked.

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 =