The term ’active immunity' means
Resistance developed after disease
Resistance developed before disease
Resistance rate of heart beat
Increasing quantity of blood
It’s obvious.
Definitions / Explanation : $B$-lymphocytes & $T$-lymphocytes
Give scientific reasons : Autoimmune diseases are different from immune deficiency diseases.
Physical barrier = ………….. and physiological barrier = ………….
‘Pathogens' are
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