Answer
$$\frac{1}{m^{2}}$$
Work Step by Step
A negative exponent is equivalent to the reciprocal of the same positive exponent and any variable raised to the 0 power is just 1:
$$m^{-2}n^{0}=\frac{1}{m^{2}}\times 1 =\frac{1}{m^{2}}. $$
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