It's oxygen.
Hope this helps,
-Starry<span />
Umm.. well if if you talk about the cell level then the organelles would be cell wall, plastid and a large central vacuole. However if you talk about finding them visually, Leaves, roots and flowers. Pretty simple dude.
<span>All multicellular organisms have specialized cells.</span>
she might have vocal chord paralysis or vocal chord nodules/polyps. it might also be vocal chords being stretched too much and puberty.