The subunits of atoms are electrons, protons, and neutrons.
It depends on the certain shampoo.
All plastics can be recycled, including polystyrene (styrofoam). However, for various reasons, including transport costs, polystyrene is not often recycled. Check your local recycling people to see if they have a depot.
Styrofoam can be recycled but because there is no large scale market for it , styrofoam is usually not included with the usual paper and plastic pickup recycling given by the city. A city will however have a pickup and drop-off locations.
A full article is much more complete than a communication. A communication will briefly describe a recent and (usually) important result, and is often followed up by a full article with further detailed results from a more in-depth study.
Carbon dioxide gas is actually bubbled thru cold water until it reaches a saturation level. The colder the water the more carbon dioxide it can hold. In reality just cold tap water temperatures are used but the gas is applied at pressure. If you raise the pressure on the water (usually done in a pressure vessel) and bubble carbon dioxide thru it you can reach higher saturation levels of CO2 which will be retained long enough for the carbonated sugar water to be put in the bottling line.