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

Agas in a balloon at constant pressure has a volume of 160 ml at -125*c. what is its volume at 29.0*c?

Which of the following would have less momentum than a 52 kg cheetah running at 10 m/s?

Look at the spectrums of a star moving towards earth and a motionless star. which of these is a correct inference that can be draw from the observation of the two spectrums? (2 points) the spectrum of a motionless star is difficult to be viewed separately using oridinary telescopes. the spectrum of a motionless star is identical to the spectrum of a star which moves towards earth. the spectrum of a star shifts towards the red region when the star moves towards earth. the spectrum of a star shifts towards the blue region when the star moves towards earth.