I think if we were to take out all of the plants and seal the tank then the spider would die because the plants breathe out oxygen and the spider need oxygen to survive. I think if we were to add five more spiders then we would have to add more plants so there would be more oxygen around in the tank that their breathing in. I think if there was never fruit flies then the spider would die of starvation. And plus the spider wouldn't have no energy because the spider needs its food to get energy.
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