Which of the following are the 3 main types of soil? Sand, silt, clay
Loam, silt, marble
Sand, loam, dirt
Granite, marble, clay

You are given an electron micrograph of a bacterial cell. in the micrograph you can clearly see three thin layers of different densities surrounding the cell. based on the micrograph, you can infer that this cell is and would appear after application of the gram stain procedure. gram-negative / pink gram-positive / purple gram-positive / pink gram-negative / purple