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THIS IS A PRAC 10 Mark for Review APC Ratio of Manganese to Calcium in Samples Which choice most effectively uses data from the graph to complete the statement? from Alboran Sea and Mauritanian Coast A a substantial increase in oxygenation in the Alboran Sea corresponded 100 with the local decline in L. pertusa, but the opposite relationship between oxygenation and L. pertusa was found near the Mauritanian coast. B L. pertusa declined in the Alboran Sea during a period of substantial local (micromoles per mole) Manganese to calcium ratio decline in oxygenation, but L. pertusa declined near the Mauritanian coast during a period of little local change in oxygenation. C oxygenation in the Alboran Sea was higher before the decline in L. pertusa 2 4 6 8 10 12 14 16 18 20 than after the decline, whereas oxygenation near the Mauritanian coast was relatively low both before and after the decline in L. pertusa. Approximate years before present (in thousands) D oxygenation in the Alboran Sea tended to be substantially higher than Alboran Sea oxygenation near the Mauritanian coast during the period studied. - O- Mauritanian coast The population of the coral Lophelia pertusa declined significantly around 9,000 years ago in the Alboran Sea and around 11,000 years ago near the Mauritanian coast. Using the ratio of manganese to calcium, which inversely correlates with ocean oxygenation levels, marine scientist Rodrigo da Costa Portillo-Ramos and colleagues evaluated whether oxygenation played a role in the declines of L. pertusa. The researchers concluded that oxygenation may have been important in the Alboran Sea but not near the Mauritanian coast, since