1. Dr. Dean Ornish and Dr. T. Colin Campbell have conducted research and published books that suggest a "Whole Food Plant-Based" (WFPB) diet is best for achieving optimal health. Others, such as Dr. Robert Atkins, Dr. Loren Cordain, and Dr. Robert Lustig, have advocated very different positions, with less emphasis on carbohydrates (plant-based foods) and greater emphasis on protein and fat (animal foods).

option d is correct. corroborated sources of historical evidence   is necessary to validate a claim about an event in history.

historians tend to use written sources, but audio and visual materials as well as artifacts are important objects that supply information to modern historians.

historical sources are usually divided into two categories: primary and secondary sources. depending on the historian's intent, some sources shift their designation. determining what type of sources toimplement, and the level of credibility and reliability of those sources, is a significant step in critical thinking for the historian.

explanation:

i think 3 documents.

hope i

-lavira: )