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The physician who determined that a human disease was caused by a specific living organism and proceeded to develop four postulates to demonstrate the association between a microorganism and a disease was:

John Graunt is said to be the first to employ quantitative methods to describe population vital statistics.  

The English anesthesiologist who linked cholera outbreaks to contaminated water and innovated several of the key epidemiologic methods that remain valid and in use today was:

Which of the following disease outbreaks occurred between 1346 and 1352 and claimed up to one-third of the population of Europe:

The number of existing cases of a disease or health condition is known as the incidence.  

Those members of the population who are capable of developing a disease or condition are known as:

  Which of the following is a difficulty in using operant conditioning:  

According to ecopsychologists, because there is synergy between human health and planetary health

What has to happen for a conditioned stimulus to produce the conditioned response?

Feinberg found (in the Apocalypse Soon? article) that