What does a virus contain?

Which one of the following oxides is expected to exhibit paramagnetic behaviour?

Animals devoid of respiratory,excretory,and circulatory organs are:

If an organism is in the same $Class$ but not in the same $Family$, then it may belong to the same:

If $\tan A + \cot A = 4,$ then $\tan^4 A + \cot^4 A$ is equal to

The minimum force required to move a body up an inclined plane is three times the minimum force required to prevent it from sliding down the plane. If the coefficient of friction between the body and the inclined plane is $\frac{1}{2 \sqrt{3}}$,then the angle of the inclined plane is (in $^{\circ}$)