What is the function of the mitochondria?
a.
to secure the nucleus at the center of a cell
b.
to provide energy for the cell
c.
to provide immune defense for the cell
d.
to move materials in and out of the cell

If you'd ask me the tones of writing then I would say it depends. Tones of writing are very different when it comes to very different stories. Stories come in various moods. Tone, in a piece of literature, decides how the readers read a literary piece, and how they should feel while they are reading it. It stimulates the readers to read a piece of literature as a serious, comical, spectacular, or distressing manner.