Which of the following supports a dense population of plankton and littoral vegetation?

How many geometrical isomers are possible for the complex $[Mab(AB)_2]^{\pm n}$?

Which ion binds with troponin during muscle contraction?

If the slope of one of the lines given by $ax^2+2hxy+by^2=0$ is two times the other,then:

If $BaCl_2$ ionizes to an extent of $80 \ \%$ in aqueous solution,the value of van't Hoff factor is

$A$ solid sphere of mass $M$ and radius $R$ is rotating about its diameter. $A$ solid cylinder of the same mass and radius is also rotating about its geometrical axis with an angular speed twice that of the sphere. The ratio of their kinetic energies of rotation ($K_{\text{sphere}}$ to $K_{\text{cylinder}}$) will be