Which of the following is not a class of $Bryophytes$?

The chemical entities present in the thermosphere of the atmosphere are:

Which of the following is the composition of a virus?

The value of '$a$' for which the three given planes
$P_1: (a+1)x - y - z = a$
$P_2: x - (a+1)y - z = a$
$P_3: x - y - (a+1)z = a$
have no point in common,is

If a solid sphere is rolling,the ratio of its rotational kinetic energy to the total kinetic energy is given by:

The plant group that lives in an amphibious state between algae and pteridophytes is known as ......