Which part of the world has a high density of organisms?

Neurogenic heart is a characteristic of.......

If the slope of one line of the pair of lines $2x^2 + hxy + 6y^2 = 0$ is thrice the slope of the other line,then $h =$

Which of the following is not an antibiotic?

At the temperature $T$ $(K)$ for the reaction $X_2O_{4(l)} \rightarrow 2XO_{2(g)}$,$\Delta U = x \ kJ \ mol^{-1}$ and $\Delta S = y \ J \ K^{-1} \ mol^{-1}$. The Gibbs energy change for the reaction is (Assume $XO_2$ is an ideal gas):

$A$ hollow metal sphere of radius $5\, cm$ is charged so that the potential on its surface is $10\, V$. The potential at the centre of the sphere is.....$V$