Occurs most often in tropical regions. Also called schistosomiasis . One billion equals 1,000,000,000 or one thousand million. The variability among living organisms from all sources, including land based and aquatic ecosystems, and the ecosystems of which they are part. These include diversity within species, between species, and of ecosystems.
Diversity is the key to ensuring the continuance of life on Earth.
It is also a fundamental requirement for adaptation and survival and continued evolution of species. The number of births in a year per 1,000 population. The money or wealth needed to produce goods and services. See also human capital and physical capital . The population that an area will support without undergoing environmental deterioration.