Oxygen is a critical component in any fire. however, it is generally not a limiting factor in natural fires because oxygen (o2) makes up % of earth’s atmosphere.

The minerals found in bones are deposited by living cells called

An observation that requires measurement is called quantitative observable or qualitative

Select all of the statements which are true. electrons are located in shells or orbits around the atom. electrons orbit slowly around the atom. electrons travel in one flat path around the nucleus of an atom. the valence of an atom is determined by the number of electrons in the atom's outermost shell.