Blood spatter can indicate: the direction in which the blood was travelling.

the angle the blood hit a surface.

the origin point of the stain.

All of the above.

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