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Biological Changes and Interdependence Review Sheet Symbiosis: A ____________________ ____________________ between two or more different species. The three types are: ___________________ : Both organisms benefit ___________________ : One benefits, other is harmed ___________________ : One benefits, other is unaffected ____________ ______________: A historical sequence of life provided by fossils is known as this. It gives us clues about changes in the: ____________________ and ___________________________. It fossils are found in deeper layers they are _____________ like current organisms today. Why are there gaps in the fossil record? ______________ are things that have helped organisms survive over time. Why do some of these change over time? __________________ ________________ is the process in which organisms best fit for their environment will survive. Define abiotic factor – Define biotic factor – In a food web: What is the primary source of energy? Where does that energy travel to? __________________ : Produces its own food __________________ : Eats other organisms (plants/animals) __________________ : Eats dead organisms __________________ : Breaks down remains of dead organisms A niche is an organism’s _____________ for the ecosystem.