ecosystem

An ecosystem is a community of organisms interacting with each other and with their environment such that energy is exchanged and system-level processes, such as the cycling of elements, emerge.An ecosystem is a community of organisms interacting with each other and with their environment such that energy is exchanged and system-level processes, such as the cycling of elements, emerge.

biosphere

The biosphere is the biological component of earth systems, which also include the lithosphere, hydrosphere, atmosphere and other "spheres". The biosphere includes all living organisms on earth, together with the dead organic matter produced by them. The biosphere concept is common to many scientific disciplines including astronomy, geophysics, geology, hydrology, biogeography and evolution, and is a core concept inecology, earth science and physical geography. 

production and productivity

In an ecosystem the connections between species are generally related with the food chain.There are three organisms cathegories:

• Producers: generally plants because they are able to produce photosynthesis.

• Consumers: herbivor animals as primary consumers, carnivore animals as second consumers and omnivore animals as third consumers.

• Descomposers: bacterias,fungis and insects that degrade organic materia.