Recycling is the process of reusing old materials such as plastics, throwable goods and other materials to be utilized for other purposes. This practice helps safe the environment especially the current conditions. The global warming, pollution and deforestation are all destructive occurrences and are man-made.
You can automatically eliminate B and D because they have little to do with the movement of the body. And it's not A because the skeletal system doesn't have the signals to tell the muscular system what to do.
