Ecosystems are Closed Sustainable Systems
Ecosystems are efficient in the transfer of energy between trophic levels
Competition for food and resources in a trophic level causes species to adapt
These adaptations or changes allow the species to increase their change of survival (speciation)
Species find habitat offering the best food and shelter (natural resources) with the least competition
The fittest individuals within a species survive to reproduce (natural selection)
Their offspring have an advantage in exploiting the natural resources in their trophic level