In order for a train to move on the tracks there must be friction between the and the Bill Nye Video

Compare and contrast physical changes with chemical changes.

The organs inside the body and how they function together

Essay-alternative energy sources research sources of energy that are being developed. write a report of 350-400 words discussing the information you learned concerning the development of various energy sources and the impact that you think they will have on your life. include sources cited at the end of your report using the mla format. follow the rubric guidelines. note that wikipedia is not an appropriate resource for a research paper. worth 99