MCQ
$DNA$ replication is aided by
- A$DNA$ polymerase only
- B$DNA$ ligase only
- ✓Both $DNA$ polymerase and ligase
- D$RNA$ polymerase
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$a$ - animal, $b$- viroids, $c$-bacteria $d$ - virus, $e$ - algae.
Reason : Oxygen started accumulating in the atmosphere after the non-cyclic pathway of photosynthesis evolved.