| bioconcentration | an important aspect of toxicology. It is the accumulation of a contaminant in one tissue or organ of an organism’s body. |
| biomagnification | the increase in tissue concentration of contaminants or substances through a predator-prey relationship, the primary means is through ingestion |
| biological oxygen demand (BOD) | a measure of the amount of oxygen consumed during biological and chemical processes that break down organic matter in water |
| community | combination of all the existing populations living in one area |
| ecology | science that studies the interrelationships between living organisms and the interactions between them and their enironment |
| food web | food chains within an ecosystem are interrelated and interconnected to form a food web |
| hydrologic cycle | movement of water throughout the environmt from the atmosphere to the earth |
| Law of Tolerances | organisms have an ecological maximum and minimum |
| niche | an organism’s place, position or role in relation to other interacting organisms and their environment |
| pollution | the introduction of any physical phenomena, biological agent, or chemical substance that has an adverse impact on the aquatic system |
| population | a group of individuals of same species living in one location |
| species | only breeds with own kind. Has a common gene pool |
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