Answer:
Primary sources are those sources that are closest to the origin of the information. e.g research
Secondary sources are often just the analysis, interpretation, and synthesis of primary sources . like textbooks, articles,e.t.c.
Explanation:
Probably annoyed, i mean why dont they mention it? It wouldnt take a second. And thats the persona work not yours
When you say physical capital, it refers to the additional machinery, building, space etc.
Therefore an example of changing physical capital is B. Building extra space in the factory. By doing this, you are adding additional physical location in where your employee or worker can work.