Simplify the expression. \( \left(-n^{5}\right)^{5}=\square \)

To simplify the expression \( \left(-n^{5}\right)^{5} \), you apply the power of a product rule, which states that \( (a \cdot b)^{m} = a^{m} \cdot b^{m} \). Here, \( a = -1 \) and \( b = n^{5} \), so you get: \[ (-1)^{5} \cdot (n^{5})^{5} = -1 \cdot n^{25} \] Thus, the expression simplifies to \( -n^{25} \).