SCIENCE Which best describes the process the respiratory system goes through to provide oxygen to the body? A.
Air travels in and down the trachea, through the bronchi, and into the alveoli where it is absorbed into the blood.

B.
Air travels in and down the bronchi, through the alveoli, and into the trachea where it is absorbed into the blood.

C.
Air travels in and down the alveoli, through the lungs, and into the bronchi where it is absorbed into the blood.

D.
Air travels in and down the lungs, through the alveoli, and into the trachea where it is absorbed into the blood.

chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances. these processes are called chemical reactions and, in general, are not reversible except by further chemical reactions. some reactions produce heat and are called exothermic reactions and others may require heat to enable the reaction to occur, which are called endothermic reactions. understanding chemical changes is a major part of the science of chemistry.

plasma - state of matter made up of electrically charged particles