Which research method uses information that governments, businesses, and educational institutions have already made available for public use? a. survey b. correlational research c. cross-cultural research d. secondary analysis

The answer is; B

In this type of research, the researcher compared between variables from the different spheres and find a correlation.  There is no extraneous variable in this type of research. An example, in this case, would be finding a statistical relationship between funding, by the government, towards education in several financial years and the number of enrolled students in public universities.

b would be the right answer

1. a tropical dry forest carries out more rapid nutrient cycling