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Cells. They're everywhere. As much as you'd like to ignore them, you can't -- they're what make
up you, your friends, and just about everything else in the world.
So what are cells, exactly?
A cell is basically the smallest unit of life. It's the tiniest organism in the world that is
able to reproduce, grow, and carry out important life processes. Millions of cells make up each living thing, each miniscule
cell constantly working together to make sure everything in your body keeps working correctly.
There are two types of cells: prokaryotic and eukaryotic. Prokaryotic cells don't have a nucleus or any membrane-bound organelles (unlike the
picture to the left). They're the most basic unit of life. Eukaryotic cells, however, do have a nucleus and more complex
body structures. You'll learn more about them in Prokaryotic or Eukaryotic?
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