How many bones are there in the human body? Which bone is the longest? Or the smallest? Without bones, you would be a blob, like a jellyfish or a worm. Our bones support us and protect our insides. They work together with our muscles to allow us to do all the things we do! So when you think of your bones, say "Thank you!" A Step Into Reading Book--Step 2: Reading with Help books have basic vocabulary, short sentences and simple stories. Paperback, 6" x 9"