The production and conduction of action potentials in the heart produces a recordable tracing of the electrical activity of the heart called a(n).

protistas excret ethanol used in the manufacture of vinegar

yes, because even though a theory has a  lot of evidence to support it, it is not always true

air enters through the nose, moves through the nasal cavity, the pharynx, the larynx, enters the trachea, moves through the bronchi andbronchioles till the alveoli.