11. The Nickel ( 1995 ) exclusion of biogenic substances was not universally adhered to. 12. Most natural gas was created over time by two mechanisms : biogenic and thermogenic. 13. About 30 % of people are sensitive to biogenic amines, such as histamines. 14. It forms biogenic habitat by creating large aggregations of hundreds to thousands of individuals. 15. Other biogenic amines may also have an effect. 16. Biogenic deposition from suspension may also supply sediment to these deepwater bottom-currents.17. Coal derived methane appears to be mostly thermogenic in origin with some biogenic production. 18. Diatoms, radiolaria and siliceous sponges use biogenic silica as a structural material for skeletons. 19. As an alternative, several researchers have investigated the precipitation of metals using biogenic sulfide. 20. Various kinds of rock coatings have developed on these lavas, some of biogenic origin.
