Given a disfluent sentence, modify the sentence to it to its equivalent fluent form, preserving the meaning of the sentence.

What all is balanced in an open system of particles no sorry what is internally missing from this system?
In an open system of particles, there are no internal what?

What meetings are open umm I mean closed to the public?
What meetings are closed to the public?

What do cilia, no I'm sorry, what do epithelial cells fill most of in the Nuda?

What do ephithelial cells fill most of in the Nuda?