McMaster Health Science program supplemental -- "Zero"

Hey guys I'm applying for McMaster's health science program and this is my supplemental
There are supposed to be three questions, I am still working on the first one because I had to redo it.

This is the second one

Select a four letter word in the English language which should be preserved and explain why (no
contractions).
Long Answer (1500 Character Maximum)

"Something" is the absence of "nothing"; therefore, "nothing" is a base or foundation used as a reference used to define "something". Without "nothing", "something" doesn't exist. The absence of quantity is defined by the four letter word: "zero". The four millennia old concept has experienced a multitude of transformations before arriving at its most concise and conceptual form yet: the English word "zero". This is a word that should survive through time because of the immensely important concepts that it represents.

The importance of zero is certainly undisputable. It is used as a base for measurment on many widely used scales such as the Kelvin scale for temperature. Further, zero is used extensivly in set theory; for example, all natural number are defined recursivly by zero. This also makes zero an integral foundation used in the proof of mathematical induction. In binary, zero represents a circuit's state when it is off, expanding its applications to all digital devices.

Zero possess a plethera of applications because, it is a major corner stone in mathematics, which it self has a multitude of applications. Its extensive use in present day society certainly serves to forshadow the potential magnitude of its use in the future. Even if a vast amount of knowledge was lost, it could always be regained if a foundation was present. Zero is a foundation.

This is the third and last one. I have no idea what to even mention! If you have any ideas that you think might be good please tell me

""Describe your most difficult experience in dealing with others and how did you handle the situation?
Long Answer (1500 Character Maximum) ""

The main part of this thread is the second one, so please edit and proofread it! I will be sure to return the favour.
Thanks guys!

I think this last sentence of the first paragraph could be modified so that it sums up or lists some of the important concepts. That will contribute to the essay's structure. Instead of saying it should survive through time because of "important concepts," you can list some of those concepts in the second half of this sentence. Then, the rest of the essay can explain those concepts.

Zero possess a plethera of applications because, it is a major corner stone in mathematics, which it self has a multitude of applications. I think this sentence does not carry enough meaning, and the essay might be better without it. You could replace it with any sentence you think will resound with poignancy in the reader's mind. :-)

In the zero essay, I think it's important to come up with one sentence that expresses the main idea about why zero is so fundamental or meaningful. It's not good enough to have many reasons; you should give one main concept that will linger in the reader's mind. What is the most meaningful thing about zero?

The difficult experience essay: Maybe you can write about a difficult experience that has something to do with your chosen field of study. Show the reader that you have experienced difficulty while pursuing the same expertise that you are now pursuing by applying to this program. That'll win them over ;-)