Ecology: the biological counterpart of public health.
D000818:Animals; D004199:Disease Vectors; D004463:Ecology / Q000639:trends*; D005523:Food Supply; D006801:Humans; D008603:Mental Health; D011157:Population Dynamics; D011634:Public Health / Q000639:trends*; D012722:Sewage; D014876:Water Pollution
D012722:Sewage