It only accumulates under acidic conditions. It consists only of moss remains. Atmospheric pressure is low in Taheti. Upwelling of ocean water occurs off the Peruvian coast. There is an increase in oceanic surface temperatures from the South American Pacific coast to waters off northern Australia-Indonesia.
Positive feedback processes ii.
Mycorrhizal symbiosis iv. A new virus, that is carried by mosquitoes which only attack a live pest, is introduced in a pest population. A change in the genetic structure of the pest population is likely to occur. The virus will become increasingly virulent. A change in the genetic structure of the virus is likely to occur.