bulk filter-feeding (baleen only) (not to scale) Pleist. 1.8 Pliocene 5.3 Late bulk filter- macrophagy (teeth only) feeding (teeth/baleen)- 11.6 Middle 15.9 Early 54(3) 23.0- Late 28.0- 63(4)- 194(8) 100(13) 92(5) Early 76(4 large body size ledentulous rostrum| 57(2)~ 34.0- baleen elongated and flattened rostrum Late 99(9) 38.0- Middle small body size foreshortened rostrum fibrocartilaginous mandibular symphysis broad-based rostrum 48.6 Early 5. 100(35) Figure 1. The phylogenetic tree of the Mysticeti. Question 3. Janjucetus hunderi was a small, toothed whale that was thought to actively hunt prey rather than filter feed. Why is it considered to be a basal mysticete rather than an odontocete? Eocene Oligocene Miocene Zygorhiza

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Named after Hans Christian Gram, a Danish bacteriologist, Gram stain is one of the most powerful staining techniques within microbiology. This technique was introduced in 1882 to identify pneumonia-causing organisms. The Gram staining technique uses crystal violet or methylene blue as primary staining colors to distinguish gram-positive from gram-negative organisms. Under a microscope, the gram-positive organisms appear purple-brown, retaining the primary color. Gram-negative organisms appear pink or red as they do not acquire the color of the primary stain.