Which philosopher said that "It is what makes it what it is".

Thomas Aquinas

Explanation:

Thomas Aquinas, an Italian philosopher, proposed on the importance of "matter" and "form" as two elements that make up a man.

According to him, "matter" refers to the things that we see around us such as trees, cars, houses, etc. while "form" refers to an abstract quality or essence of these things (matter).

"It is what makes it what it is" means that every human being has a specific soul that makes him different from all the other organisms in the world. This gives the person the lifeblood or essence which cannot be found in animals, plants and other organisms living on earth.

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