1. recall that scientists divide the earth's layers based
on chemical composition and physical makeup. which
option is not a layer based on physical makeup?
a. asthenosphere
b. crust
c. mesosphere

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