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.
It includes relationships between. organisms and their physical environments (physiological ecology); between organisms of the same. species (population ecology); between organisms of different species (community ecology); and. between organisms and the fluxes of matter and energy through biological systems (ecosystem.