You are asked to test the biochemical oxygen demand of a stream in your town. After observing the BOD over a week, you calculate that the water has a BOD of 150 mg of oxygen, which is a relatively high level. This leads you to conclude that
A. the water has a high level of oxygen
B. The water is likely contaminated with high levels of pollution or waste
C. the water quality is safe for most aquatic organisms
D. The high level of oxygen demand is likely caused y natural decomposition
E. The water is safe for drinking

Darla claims that the first periodic table developed by mendeleev was not completely accurate, so it is not useful at all. harmony argues that it establish the periodic table we use today, making it more credible. who is correct and why? darla is correct, because a model that has any mistakes should be thrown out. darla is correct, because a good model would not need to change. harmony is correct, because mendeleev’s model had all of the information correct in the first version. harmony is correct, because mendeleev’s model made predictions that came true.

What natural processes produce large quantities of co2

What is the indicator of the number of ions in solution? the amount of conductivity the amount of precipitate the amount of solute added