energy sources take many forms, including nuclear energy, fossil energy -- like oil, coal and natural gas -- and renewable sources like wind, solar, geothermal and Hydro power. Energy is essential to life and all living organisms. The sun, directly or indirectly, is the source of all the energy available on Earth
Katelyn is not putting any effort to do the job by not contributing, but still gets rewarder for the high grade. A free rider is someone who takes credit for a job the person did not do. Katelyn is taking this type of credit, so she is a free- rider.
