Which substance is secreted by eosinophils during an allergic reaction?

  • A
    Histamine
  • B
    Heparin
  • C
    Prothrombin
  • D
    Serotonin

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The blood components required for the production of antibodies are . . . . . . .

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Which of the following are required for blood clotting in mammals?

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Match the following columns:
Column-$I$ (Blood Group)Column-$II$ (Can donate blood to)
$P$. $A$$I$. $AB$
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