Cells: The Building Blocks of Life

All living beings are made up of cells. Some of them are made up of only one cell and others have many cells. The average adult human body has around 37.2 trillion cells. WOW, that's a lot of cells. So many, in fact, that it's hard to picture. But let's try to imagine it: If we lined up all the cells in a human body end to end, could the line reach around the Earth? Watch this video demonstration for some intersting facts about the cells.

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