Answer:
They are called the building blocks of an organism because all living things are made up of billions of cells that can reproduce, build and change that's why it is called the building blocks of all living things.
Explanation:
The density would stay the same.
The density would stay the same as density is an intensive property meaning it doesn't change based on the amount of matter that you have.
similarity: they are column shaped
difference: pseudostratified epithelial cells have cilia
