The moon has more surface craters than earth does because the moon has a) a surface more sensitive to impacts b) no significant atmosphere c) a stronger gravitational force d) a smaller diameter than earth

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