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.
1 It includes all physical, chemical, and biological conditions a species needs to live and reproduce in an ecosystem.  Ecology - study of the interactions of living organisms with one another and with their nonliving environment of matter and energy; study of the structure and function of nature.