You are designing an artificial ecosystem.  Which of the following things should you do if you want to mimic a real ecosystem?  All below refer to what you should do AFTER the ecosystem is started (i.e. NOT what you need to do at the start but what you need to do to keep it going). 1. Input energy regularly 2. Allow heat to escape 3. Remove matter regularly 4. Add matter regularly Group of answer choices a. 3, 4 b. 1. 4 c. 1, 2 d. 2, 3

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