It would be C, The internal structure of cells withing the body. Microscopes are designed to look at cells, as the magnification is at that level.
It helps the cytoplasm work more and not die
when replication mistakes are not corrected they may result in mutations which sometimes can have consequences
Horizontal lines, like the horizon. That's how I remember it, anyways. Or on a globe, latitude lines. My teacher always taught us "FAT-itude lines."