In embryonic stage $RBCs$ develop in
Liver and kidney
Liver and spleen
Spleen and kidney
Liver and pancreas
The inability to distinguish between self cells and non-self cells may lead to
‘Bacillary dysentery' is caused by
Main barrier which prevents the entry of disease's causing organism in our body is
Full forms : $RBC$
Fertilization and development of plasmodium occurs in