Phylogenetic trees are a depiction of what?

A. How individuals of the same species are related to each other.
B. How different species are related to each other.
C. How family members are related to each other.
D. How species are evolving towards perfection.

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