Helen and Eric are cohabiting.
Cohabitation is a term for individuals who are in a sexual relationship, living together, but are not married at the moment. Eric and Helen are all of those things - they are not married and have no plans to get married in the near future, which is why they are only cohabiting (living together) for the time being.
The environmental movement, also including conservation and green politics, is a diverse scientific, social, and political movement for addressing environmental issues.
To provide a greater certainty that the observed results are not by chance.
Answer:
C. a cross-sectional study.
Explanation:
A cross-sectional study -
It refers to the observational study , where a single point is considered at a particular time period from the crowd , is referred to as a cross - sectional study .
It is also known as prevalence study , transverse study and cross-sectional analysis .
Hence, from the given scenario of the question,
Professor Juarez is conducting a cross - sectional study .