ANSWER (IF YOU ARE LEARNING ABOUT LIFE SCIENCE):
I've learned that science is far more intricate than we think. Nearly everything on our earth is classifiable on almost all levels, physical appearances are not random, and on a microscopic level there is a whole other world. Everything we see on earth is made from cells, the building blocks of life, and atoms, the building blocks of the universe. Humans themselves are no exception. We function by the help of organs and organs systems which is another part of the classification system.
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