DEFINITION:1 a) the branch of biology that deals with the relations between living organisms and their environment b) the complex of relations between a specific organism and its environment 2 Sociology the study of the relationship and adjustment of human groups to their geographical and social environments. 1869: Birth of ecology. Most people are unaware [...]

HOW DDT KILLED THE ROBINS. Dutch elm disease threatened to destroy most of the majestic elms that once flourished along residential streets. To eliminate the beetles that carry this fungus disease, many communities sprayed their elms with massive doses of DDT. The pesticide stuck to the leaves even after they fell in the autumn. Earthworms [...]

WATER CONSERVATION Polluted water in one part of the world affects water sources everywhere. This happens because water moves through what is called the hydro logic cycle. In the hydro logic cycle 1) water moves into the air and clouds as it evaporates from oceans, lakes, and rivers. 2) the winds that blow around the [...]