Answer: move them and put them on the shelf then open the door
Explanation:
Substitution is a small scale mutation. It doesn't hold a major effect like insertion and deletion. Insertion and deletion cause frameshifts, which can change all the codons after it, therefore coding the incorrect proteins. Hope this helps!
I believe it is
<span>a) Khánh hears the ticking of the clock.
</span>
I hope this helps!
<span></span>