Scientists have studied the fossilized shells of prehistoric, single-celled marine organisms. Some of these shells were thin, which
indicates that the organisms lived in very warm ocean water. Such evidence indicates that the climate during this time may have been
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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