Breeding is unregulated and natural selection prevails.
The terrace formation of the land characteristic of other coast regions of South Africa prevails in Natal.
A relative scarcity in running waters prevails in the whole region between the Danube and the Drave.
The banken veld district is also generally healthy though hotter than the plateaus, and malarial fever prevails in the lower valleys.
These infarcts are most common in organs provided with a terminal circulation, such as prevails in the kidney and spleen.