Chemical reactions in the real world are very easy to find, for example when burning paper. The paper was originally still a white sheet, after being burned using fire, then the paper was burnt. What are Chemical Reactions? Here are The Definition and Characteristics

In general, the word “energy” refers to a concept that can be paraphrased as the potential to cause change. Here are The Energy Definition, Types, and Benefits

Axial skeleton is a skeleton located in the middle of the body which includes the skull, sternum, ribs and spine. Here are The Axial Skeleton Definition, and Parts