What are the disadvantages ofmulticellularity?

The disadvantages ofmulticellularity are
(i) Specialised cells often lose the power of division, so that injury is not repaired, e.y., Nerve cells. (it) Regeneration ability of multicellular organisms decrease with specialisation.
(iii) Specialised cells may lose vital functions in order to carry out specific activity, e.g., RBCs, sieve tube cells.