Chemical substances may be combined or converted to others by means of chemical reactions. Forms of energy, such as light and heat, are not matter, and are thus not substances in this regard.
Halophiles are organisms that thrive in high salt concentrations. They are a type of extremophile organism. The name comes from the Greek word for salt-loving. While most halophiles are classified into the Archaea domain, there are also bacterial halophiles and some eukaryota, such as the alga Dunaliella salina or fungus Wallemia ichthyophaga. Some well-known species give off a red color from carotenoid compounds, notably bacteriorhodopsin.
A pedophile is a person who has a sustained sexual orientation toward children, generally aged 13 or younger, Blanchard says. Not all pedophiles are child molesters (or vice versa). Child molesters are defined by their acts; pedophiles are defined by their desires, Blanchard says. Some pedophiles refrain from sexually approaching any child for their entire lives.. But it's not clear how common that is.