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G4
1. g 4
What is the effect of a small stream
near human activity on a larger river
in terms of BOD?
hypothesis
BOD
10
8
6
4
BOD
2
0
Small Main -I Main I Main II Main III
Inflow
Sung Soo, Angela, Tiia
4. 9
data
8 2.5
Dissolved oxygen content
2.074 2.102
7 2
6 1.991
1.5
ml/L
5
1.459 Sample 1
4 1
Sample 2
3 Sample 3
0.5 0.779
2
1 0
0 Small Main I Main II Main II Main -I
Inflow
Small Main I Main II Main III Main -I
Inflow BOD change