MCQ
Emphysema is a chronic disorder which is caused due to
- ADamaged trachea
- BDamaged nostrils
- ✓Damaged alveolar walls
- DDamaged lungs
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$Statement 2$: Certain contraceptives are planted under the skin of the upper arm to prevent pregnancy
$(i)$ Due to alteration of $DNA$ sequences genotype is change.
$(ii)$ Changes occur in phenotype.
$(iii)$ Variation create in $DNA$