Introduction After a heavy rain, I walked outside and saw some pinkish soft worms. I was wondering where did they come from. Later when my parents were digging in the back yard to plant a small tree, I noticed that these worms are under ground. Immediately I thought since worms live underground, they possibly eat plant root and maybe that is what makes some plants die. So I started to remove the worms and throw them in the garbage can.

Recently in a television program I saw someone who produces worms as her business. She was actually selling the worms to gardeners because worms are good for soil and plants. 

I was totally confused by now, so I decided to select this science project and find out how can the worms be good for the soil and how can someone make money from selling earth worms. I also want to know how we can identify the sex of the worm and how we can identify adults from children. Finally I plan to learn about the life-span and reproduction rate of earthworms.