Biotechnology is technology based on biology, especially when used in agriculture, food science, and medicine. The United Nations Convention on Biological Diversity defines biotechnology as: Any technological application that uses biological systems, living organisms, or derivatives thereof, to make or modify products or processes for specific use. Biotechnology is often used to refer to genetic engineering technology of the 21st century, however the term encompasses a wider range and history of procedures for modifying biological organisms according to the needs of humanity, going back to the initial modifications of native plants into improved food crops through artificial selection and hybridization. healthcare, is the prevention, treatment, and management of illness and the preservation of health through the services offered by the medical, nursing, and allied health professions. Health care embraces all the goods and services designed to promote health, including �preventive, curative and palliative interventions, whether directed to individuals or to populations�. The organized provision of such services may constitute a health care system. This can include specific governmental organizations such as, in the UK, the National Health Service or a cooperation across the National Health Service and Social Services as in Shared Care. Before the term "health care" became popular, English-speakers referred to medicine or to the health sector and spoke of the treatment and prevention of illness and disease.