sewage
The waste water from domestic, commercial and industrial sources carried by sewers.
Waste matter carried away in sewers or drains.Human waste, often toxic to many organisms which can be treated in a variety of ways to eliminate its dangerous components.
With regard to the population size of a species and what factors may affect them, two factors have been defined. They are the density-dependent factors and the density-independent factors. Find out the differences between the two in this tutorial. Know how these factors affect populations in an ecosystem...
