• All living things depend on their environment to supply them with what they need, including food, water, and shelter.
  • An organism is an individual living thing.
  • Many living things interact with other organisms in their environment.
  • In fact, they may need other organisms to survive.
  • This is known as interdependence.
  • Other interactions between living things include symbiotic relationships and competition for resources.
  • Symbiosis is a close relationship between organisms of different species in which at least one of the organisms benefits.
  • Competition occurs whenever the two species try to get the same resources in the same place.
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