A Drop of Blood

　　You've seen your own blood, when you have a cut or a scrape. You can see the veins in your wrist, and you've seen the scab that forms as a cut heals. But do you know what blood does for you? Without blood, you couldn't play, or grow, or learn. That's because just about every part of your body needs blood, from your muscles to your bones to your brain. How does your body use blood? Read and find out!

作者簡介

Paul Showers

　　Paul Showers wrote twenty books for the Let's-Read-and-Find-Out Science series, including favorites such as What Happens to a Hamburger? and Where Does the Garbage Go? Mr. Showers worked on the Detroit Free Press, the New York Herald Tribune, and for thirty years, the Sunday New York Times.