Why the drift of the positive ions is not considered?

What is the order of the drift velocity of electrons?

Why are mitochondria/chloroplasts not considered with the endomembrane system?

The volume charge density within a volume is rho(r ) . What is the force on a small test charge q_0 placed outside the volume having position vector vector r_0 with respect to the same origin considered to specify the position vector of the charge distribution within the volume.

What is principle of super position?

GIVE REASONS - WHY : The apparent position of the stars is not stationary.

What are zwitter ions?