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Human-made ecosystems are artificially created by humans, such as aquariums, zoos, botanical gardens, and orchards. Deserts, on the other hand, are natural ecosystems formed by climatic and geographical conditions.
16 23 31 40 50 61 ?
...104 106 110 113 ? 126
64 48 36 22 16 8
11, 12, 16, 25, ?, 66
231 451 671 242 485 264
...50 62 ? 96 126 138
...21 23 26 ? 39 51
...22, 23, 31, 57, 122, 247
7 12 33 ? 635 3804
...48 50 54 57 ? 70
