Final answer:
The document style commonly used in the natural and applied sciences is the APA style, which focuses on author-date citations appropriate for these fields.
Step-by-step explanation:
The document style commonly used in the natural and applied sciences is the American Psychological Association (APA) style. This style is preferred in fields such as education, psychology, and the sciences, highlighting authors and dates of publication to emphasize the timeliness which is important in these areas of study. APA style is often used in fields such as education, psychology, and science. It emphasizes authors and dates of publication because timeliness of published material is important in these disciplines. When writing research papers or articles within these disciplines, one would typically follow the APA guidelines to format their work and cite sources accordingly.