Final answer:
Florence Nightingale's theory of nursing focused on creating a clean and supportive environment for patients. She emphasized the role of nurses in meeting patients' needs.
Step-by-step explanation:
Florence Nightingale, often considered the founder of modern nursing, formulated a theory of nursing based on her observations and experiences. Nightingale believed in the importance of providing a clean and supportive environment for patients to promote healing. She emphasized the role of nurses in meeting the biological, psychological, and social needs of patients, and advocated for the use of evidence-based practices.