Answer:
Average Life Expectancy
Explanation:
According to my research and based on the information given within the question, I can say that these categories made a huge difference in the Average Life Expectancy in the United States in the last 100 years. This is because these are all categories that help you maintain your body healthy thus adding years to a persons life. About 100 years ago the life expectancy was an average of 40 years and now in 2019 it is an average of 75 years in the US.
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The dependent variables are those that are seen to change in light of the independent variables. The independent variable is the place you set the traps. They are autonomous in light of the fact that you pick where they go. Along these lines, various creepy crawlies caught are the dependent variable.
Answer: observational study
Explanation:
The observational studies are those studies where the researchers observes the samples or individuals of research without any intervention or manipulation.
In epidemiology, and nutritional studies the researcher observes the risk factors associated with the disease, diagnosis and treatment. The effect of a diet on the patient or volunteers can be done through observational studies.
