The greenhouse effect is a result of

a. reflection of solar energy by cloud cover.
b. aerosolization of dust and gases produced by volcanoes.
c. absorption and radiation of energy in the atmosphere.
d. absorption and radiation of energy in the hydrosphere.

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