Which one of the following gives Prussian blue colour?

Flatworms are:

What do pesticides include?

If $y$ is a function of $x$ and $\log(x+y) = 2xy$,then the value of $y'(0)$ is

For the reaction $2NO_{2(g)} \rightleftharpoons 2NO_{(g)} + O_{2(g)}$,$K_c = 1.8 \times 10^{-6}$ at $185 \ ^oC$. At $185 \ ^oC$,the $K_c$ for the reaction $NO_{(g)} + \frac{1}{2}O_{2(g)} \rightleftharpoons NO_{2(g)}$ is:

The concept of chemical evolution is based on