Lesson Summary

• Organisms have different relationships with each other within ecosystems. They also interact with the nonliving parts of their ecosystems.

• There are three kinds of symbiotic relationships: mutualism, commensalism and parasitism.

• Changing the interactions within an ecosystem can have significant effects on the environment.

• The scientific method is used by scientists as a way to learn more the universe.

• The scientific method consists of 1) Observation/Question, 2) Hypothesis, 3) Experimentation, 4) Analysis and 5) Conclusion/Revision.