1. Sewage Treatment
Mav Mark

2. According to Tables 1 & 2, Species 1 was present only at sites that has a dissolved oxygen concentration of:
1 ppm
4 ppm
7 ppm
10 ppm

3. Assume that a species of fish feeds only on invertebrate Species 1,2, and 3. According to the information in Table 1, one would predict that this fish species would most likely be found at which of the following pairs of sites?
Sites A & C
Sites A & D
Sites B & C
Sites B & D

4. It was hypothesized that some species could survive both in sites with high and low concentrations of dissolved oxygen. This hypothesis is supported by the data for which of the following species?
Species 1
Species 2
Species 3
Species 4

5. According to Figure 1 and Table 1, which of the following species was only found downstream of the sewage treatment plant?
Species 2
Species 3
Species 4
Species 5