Use the following to answer question:
Figure 15.13 
-(Figure 15.13) Answer the following questions. 
Definitions:
Secondary Sewage Treatment
A stage in wastewater treatment involving biological processes to degrade organic matter, following primary treatment which mainly removes solid materials.
Biological Process
Natural processes involving living organisms, such as growth, reproduction, and metabolism.
Detergents
Chemical compounds used to remove dirt, stains, and other substances by lowering the surface tension of water, commonly found in cleaning products.
Nervous System
The network of nerve cells and fibers that transmits nerve impulses between parts of the body, coordinating its actions and sensory information.
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