The length would be 2, the width would be 2, and the height would be 2. The formula for volume is length x width x height. So, you would multiply 2 x 2 x 2. The answer would be 8 micrometers cubed.
To show the different levels of classification and divide among species, and different organisms on planet Earth. It also creates a universal "language" for scientists around the world when referring to organisms (cougar & puma are the same animals; different name)
Example: The American Alligator and the Chinese Alligator (look it up!) are in the same family and genus, but are not the same species.
The cell that has the nucleus is eukaryotic and the cell that doesn't have a nucleus is eukaryotic
hope it helps

Learning about the different body parts will help us better understand human life and health because it can make us care about others instead of just are selves and encourage us to do something about the health difficulties in life.