MCQ
Gene mutation is caused by
- AReproduction
- BLinkage
- ✓Change in the sequence of nitrogenous base
- DChange in the sequence of genes in $DNA$
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$(A)$ The earliest organisms that appeared on the earth were nongreen and presumably anaerobes.
$(B)$ The first autotrophic organisms were the chemoautotrophs that never released oxygen.Of the above statements which one of the following options is correct?