Which of the following anthropogenic actions leads to evolution?

The oxidation number of $Pt$ in $[Pt(C_2H_4)Cl_3]^-$ is

If $P(n,r) = 1680$ and $C(n,r) = 70$,then $69n + r! = $

$A$ carrier signal $60 \sin(2\pi \times 10^6 t)$ is used to modulate an audio signal $15 \sin(300\pi t)$. The depth of modulation is .........$\%$.

The radii of two planets are respectively $R_1$ and $R_2$ and their densities are respectively $\rho_1$ and $\rho_2$. The ratio of the accelerations due to gravity at their surfaces is

Two waves $Y_1 = 0.25 \sin 316 t$ and $Y_2 = 0.25 \sin 310 t$ are propagating in the same direction. The number of beats produced per second is