MCQ
All chordates possess:
- AExoskeleton.
- BLimbs.
- CSkull.
- ✓Axial skeletal rod of notochord.
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$I.$ Occurs between $G_1$ and $G_2$
$II.$ $DNA$ replication begins in the nucleus
$III.$ Centrioles duplicate in the cytoplasm
$IV.$ As $DNA$ s doubled, number of chromosomes also doubles Option are