1.is the maximum number of living organisms of one species that an area's resources can sustain indefinitely without environmental degradation. 2.__refers to the wearing a way og field's topsoil by the natural physical forces of water or through forces associated with farming activities such as tillage.

3.What process describes the upward movement of pollutants or toxic substances in the food chain and become concentrated at each level?

4.What is known as the process by which body of water becomes enrich in dissolve nutrients(such as phospates)that simulate the growth of aquatic plant, life usually resulting in the depletion of dissolve oxygen?
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