What is photosynthesis? http://en.wikibooks.org/wiki/Biology,_Answering_the_Big_Questions_of_Life/Photosynthesis Photosynthesis is a process used by plants and other organisms to convert light energy, normally from the Sun, into chemical energy that can be later released…
https://www.le.ac.uk/se/centres/sci/selfstudy/eco3.htm The main species typical of a particular habitat are called indicator species. Each habitat has its own diverse and characteristic assemblage of interacting living organisms known collectively as a community, and…
http://en.wikipedia.org/wiki/Trophic_level Trophic levels and Biomass The trophic level of an organism is the position it occupies on the food chain. The word trophic derives from the Greek τροφή (trophē) referring…