There's a process that makes it possible for any of us to eat food. Without it, we'd all just be dead things. That process is known as photosynthesis. To learn more about it, click here.Sugar is necessary for life. Some things we eat just turn into sugar, and sometimes that's a good thing. What does that mean for our bodies? What does that mean for our brains?Some organisms depend on dead things for survival. Speaking of food webs, what happens to the food chain when one species is removed? Check out this lesson to ponder that question a little further.Lots of dirty things happen on the ground. But what happens to all that dead, organic material that falls to the forest floor? What about that dead, organic material we put into our trash bins? Have you ever heard of vermicomposting?We all have food preferences. Sometimes, our food preferences can alter what happening inside our guts. Each of us has a unique signature of microbes. Don't believe me? Check this out.Seasons come and go. In the winter, trees shed their leaves and flowers lose their petals -- those dead parts of plants fall to the forest floor. But what else happens during the seasons?Some things seems to live forever. When most of us are dead and gone, there will be things that will live on for hundreds and maybe even thousands more years. Really? Yes, it's true!Just in case you've ever wondered, Nature Has A Formula That Tells Us When It's Time To Die.