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East If Eden

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Interactions Among Populations in Ecosystems

Open the following site: http://www.learner.org/courses/envsci/interactives/ecology/index.php.

Read the Overview and then proceed to the next page by clicking on “The Producers”. Continue through the exercise, running the simulations as instructed, recording your data on the tables provided and answering the questions for each section on your own paper.
|The Producers: Step 1 | | |
| |Plant A |Plant B |
|Prediction: Ending | | |
|Population Size | | |
|Starting Population | | |
|Ending | | |
|Population | | |

1. What assumptions does this model make about co-dominance as well as the general terrain of the ecosystem?

2. Do you find one producer to be dominant? Why might one producer be dominant over another?

|The Producers: Step 2 | | | |
| |Plant A |Plant B |Herbivore A |
|Prediction: Ending | | | |
|Population Size | | | |
|Starting Population | | | |
|Ending | | | |
|Population | | | |

1. Does adding the herbivore establish a more equal field? Is one producer still dominant over the other? Why might one producer be more dominant? 2. If the simulation included decomposers, how would your current results

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