
![Células [Spanish] 1425847129 Book Cover](https://i.thriftbooks.com/api/imagehandler/l/0CEA8C663C6DE9D63178DE027B6D8A02B93CB567.jpeg)
Every living thing you see is made up of tiny cells. Each of these cells has its own job to do. They work together to do everything an organism needs to stay alive. That's why biologists often call them the "building blocks of life." Learn all about plant and animal cell theory...