This is the specific type of contamination, or poisoning, of lakes, rivers, oceans, and other bodies by harmful compounds such as raw sewage and industrial chemicals. what is this called?

Which leader was the first african american president at two different institutions for higher learning

Identify the example of when situation and time are key to assessing risk of harm in a research study: a study on the efficacy of a behavioral intervention for smoking cessation involves both adults and teenagersasking women if they have had an abortionresearch on the prevalence of hiv-infected individuals in communitiesa survey about sexually transmitted diseases

Which steps are important when designing and conducting a scientific experiment? hide the results from fellow scientists. identify the independent variable. eliminate all dependent variables. address any confounding variables. form a non-falsifiable hypothesis.