7. purely observational epidemiologic studies do not usually include: a) cross-sectional studies c) experimental studies b) counts d) cohort studies which of the following is used to describe toxic effects of chemicals? a) aqi c) tfr 8 b) vocs d) ldso which best describes a risk characterization a) estimates the number of excess unwarranted health events expected at different time intervals.

What is the correct order of events in the water cycle?

Which occurs when air is compressed? air molecules move slower. air temperature rises and air molecules move faster. air temperature decreases. air temperature decreases and air molecules move faster.

Which of the following is an example of a policy that may be implemented by a business that has trouble with employees using the internet for their own personal needs? a. all employees will have to take a safety training class. b. employees caught using the internet for personal needs will have to take a professional development class. c. personal interviews will be conducted to find out who is using the internet for personal needs. d. employees will be monitored, but nothing will happen if their employer catches them using the internet for personal needs.