• An ecosystem is a unit of nature and the focus of study in ecology.
  • It consists of all the biotic and abiotic factors in an area and their interactions.
  • Ecosystems can vary in size - a lake could be considered an ecosystem, as could a dead log.
  • A species’ niche is the physical environment in which a species lives and to which it is adapted.
  • Two different species cannot occupy the same niche in the same place for very long.
  • This is known as the competitive exclusion principle.
  • A habitat’s features are determined mainly by abiotic Factors such as temperature and rainfall.
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