sentences:  "T. pseudonana" was selected for this study because it is a model for diatom physiology studies, belongs to a genus widely distributed throughout the world's oceans, and has a relatively small genome at 34 mega base pairs.Scientists are researching on diatom light absorption, using the marine diatom of Thalassiosira.The diatom requires a high enough concentration of CO2 in order to utilize C4 metabolism, and this positive feedback loop is indicative of how it is responsible for producing 40% of organic carbon for the ocean floor (Clement "et al."