Pluto is the darkest planet because?

In which research method does a researcher change the value of one variable to determine how the change affects another variable? a. experiment b. observational research c. survey d. case study

For each example, identify the most appropriate ctso. ann wants to be a manager who directs the work of others: hosadecatsanational ffa teresa wants to have a career that emphasizes mathematics: fcclapastsanyfea justin wants to have a career in nursing: bpahosafbla-pblfea howard wants to have a career focused on the education of others: feafcclanyfeapas

What percentage of roads in germany have no speed limit?