Option C. 1500 is a reasonable approximation of the number of earthworms to a depth of 5 centimeters beneath the ground's surface in the entire field
Since each zone is a smaller square of side 1 meter and the field is square with side 10 meters, there would be 100 of these regions in the total field.
Since the analysis covers 10 regions, multiplying the total number in these ten regions by 10 would be a good approximation for the overall number of earthworms in the field.
We thus add up the obtained figures.
= 107 + 147 + 146 + 135 + 149 + 141 + 150 + 154 + 176 + 166
= 1471
∴ 1471 × 10 = 14710, can be approximated to an order of 15000.
Hence, Option (C) is correct.
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