MCQ
Leucocytes $(WBCs)$ are considered as true cells because
- ✓They possess nucleus
- BThey do not contain haemoglobin
- CThey show great power of movement
- DThey are responsible for phagocytic activity
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Assertion $(A)$:All vertebrates are chordates but all chordates are not vertebrates.
Reason $(R)$:Notochord is replaced by vertebral column in the adult vertebrates.
In the light of the above statements, choose the most appropriate answer from the options given below: