to few nutrients, inhibits body’s ability to fight infection, endangers pregnancy, lactation, slows growth in childhood.

in urban areas sewage flows through pipes to these plants. primary mechanical and secondary biological.

wastewater from residential and non-industrial sources that does not contain fecal waste; can be used to clean equipment, flush away waste, water lawns, and irrigate non-food crops.

species unintentionally caught

too many or too few nutrients.

herding and domesticating aquatic animals.

40% of rain exits through these