The following graph demonstrates the results of an experiment in which researchers added a specific nutrient to an area in the marine environment in either the Pacific (black bars) or the Atlantic (white bars) and recorded the level of increase in the phytoplankton blooms at that site. Based on these results, which of the following nutrients is the limiting factor in the Pacific?

MCQs on the field of Marine Biology, from a survey of the origin of oceans and their movements to details of marine food webs, life cycles, and marine zonation. As well as on marine environment and ecology, taxonomy and physiology, and contemporary concerns in the field, including human influences on marine systems.