What is the process of directly injecting pre-formed antibodies into the body called?

  • A
    Antibody injection
  • B
    Acquired immunity
  • C
    Passive acquired immunity
  • D
    Active acquired immunity

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Which of the following are associated with the defense of the body?

Match the following columns:
Column-$I$Column-$II$
$1.$ Saliva and tears$a.$ Cytokine barrier
$2.$ Mucus coating$b.$ Cellular barrier
$3.$ $PMNL$$c.$ Physiological barrier
$4.$ Interferons$d.$ Physical barrier

The 'second line of defence' is known as

Which of the following types of antibodies activates $B$-cells?

The skin and mucous membrane act as which type of barrier in innate immunity?

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