Passage VI
Scientists established 5 artificial marine ecosystems (A-E) to study the interactions of oil spills and organisms. Table 1 shows what was added to each ecosystem.
The oil, bacteria, fertilizer, lugworms, and flounders were added in early March. Figure 1 shows how the concentration of oil in Ecosystems B, C, D, and E, and the number of bacteria/mL in Ecosystems C and D changed over 16 months.
Figure 2 shows how the number of lugworms/m2 changed over 16 months in each ecosystem.
Figure 3 shows how the biomass of flounders in kilograms/1,000 m3 of water changed over 16 months in each ecosystem.
31. According to Figure 1, the oil concentration decreased most rapidly in which ecosystem?
Your Answer is
Correct Answer is C
Explanation
Look at figure 1, the oil concentration in ecosystem D drops the fastest, and drops to 0 first