Answer:
The cell was first discovered by Robert Hooke in 1665 using a microscope. The first cell theory is credited to the work of Theodor Schwann and Matthias Jakob Schleiden in the 1830s.
They let things in and out
I guess it is increasing concentration of carbon
producing a hole on ozone is because of the Freon in air conditioners and i guess all the others are wrong <span />
you change the magnification by rotating the nose piece and make sure you drop the stage first.