Select whether each example of scientific communication represents a primary source or a secondary source. A scientist is interviewed on a television program about an important discovery he made in cancer research.

An article in the journal Nature presents the original research results of a recent experiment by a group of biochemists.

An article in a small, specialized journal presents the results of a graduate student’s experiment.

A book summarizes important recent research on marine mammals.

An issue of a popular science magazine reports on some recent findings in brain research.