A MacGuffin is that object in a film which is critical to the characters, but carries insignificant meaning for the audience.
A MacGuffin, a term introduced and widely used by Alfred Hitchcock is some element which drives the plot. The audience is not very concerned with the specifics of it.

The harmonic frequency refers to the resonant frequency that is an integral multiple of the fundamental frequency, harmonics are usually simple sinusoidal oscillation at a single frequency. where as Resonance frequency are frequencies that are not necessarily sinosudal or integral multiple of fundamental frequency and it may have complex oscillations made up of multiple harmonics ~
It's like if you play a piano with a single key, it will show harmonic frequency, but if you use multiple keys at a time it may show Resonance.
Answer: Yes
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A. Referring to Gregor's Mother and Father as 'the' mother and 'the' father not 'his' mother and 'his' father
Answer:
1. it happened September 17, 1862, near Sharpsburg, Maryland
2. General George B. McClellan
3. General Robert E. Lee
4. The Union (Northern) forces
5. He wanted to take pressure off the Shenandoah Valley because it was the economic strong place of the Confederacy.
6. order No.191.
7. Union (Northern) forces
8. more than 23,000
9. Replaced him with another General
10. Freedom for the slaves in the South, once the Union took back control