Biotic factors:
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Abiotic factors:
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If one of the organisms was taken away, the rest would die off. If one of the plants became dry and died, the animal that would eat that would have no other food source - and would starve. It's important for small animals to stay alive, so predators could eat as well. A reason for a living thing to die off, is construction. Humans destroy land to put up buildings. Or even cities. The organisms would flee somewhere else where they can't survive and would eventually die off. Once one animal dies off, an entire species could too - until all the living things disappear.