Plants are usually autotrophic, even if some also are heterotrophic (carnivorous plants).
See also : Primary nutritional groups
... sum of its proper divisors.
Thus, 6 = 1 + 2 + 3 is a perfect number, since 1, 2 and 3 are the numbers which divide 6 evenly. The next perfect number is 28, as 28 = ...
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