MCQ
Fossils are dated now by
- AStratigraphic position
- BAmount of calcium residue
- CAssociation with other animals
- ✓Radioactive carbon $({C^{14}})$ contents
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Reason : Injecting the microbes intentionally during immunisation or infectious organisms gaining access into body during natural infection induces active immunity.
$(a)$ No enzyme at all
$(b)$ The normal/less efficient enzyme
$(c)$ $A$ non-functional enzyme
Reason: Histamine is a vasodilator.