By MICHAEL IP. Forty years ago, on March 29, 1973, the United States ended its military involvement in Vietnam. Although the war would continue another two years, the South Vietnamese would no longer receive American assistance.
Ecology (from Greek: Î¿á¼¶ÎºÎ¿Ï, house, or environment; -Î»Î¿Î³Î¯Î±, study of) is the scientific analysis and study of interactions among organisms and their environment. It is an interdisciplinary field that includes biology, geography, and Earth science.
ecosystem The living and non-living parts of the environment in a specific area. (Ecosystems can be really small or really large!) ecology The study of how living things are related each other and to their natural environment. Environment Everything that surrounds an organism and influences it. The study of how living things are related each other and to their natural environment.