hard · Enhanced ACT science

**Experiment 1: Dissolved Oxygen vs Temperature (salinity held at 0 ppt)** | Temperature (°C) | Dissolved O2 (mg/L) |

|---|---|

| 5 | 12.8 |

| 15 | 10.1 |

| 25 | 8.3 |

| 35 | 7.0 | **Experiment 2: Dissolved Oxygen vs Salinity (temperature held at 20 °C)** | Salinity (ppt) | Dissolved O2 (mg/L) |

|---|---|

| 0 | 9.1 |

| 10 | 8.4 |

| 20 | 7.7 |

| 30 | 7.0 |

A certain fish requires at least 8.0 mg/L of dissolved oxygen. Based on Experiment 2, what is the highest salinity at which this requirement is still met?

  1. 0 ppt
  2. 10 ppt
  3. 20 ppt
  4. 30 ppt

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