Cells use oxygen to assist in cellular respiration. This type of respiration, called aerobic cellular respiration, converts stored energy into a usable form. The first stage of aerobic cellular respiration, glycolysis, can be performed without oxygen.
A persuasive speech is a specific type of speech in which the speaker has a goal of convincing the audience to accept his or her point of view. The speech is arranged in such a way as to hopefully cause the audience to accept all or part of the expressed view.
persuasive - intended or having the power to induce action or belief; persuasive eloquence; a most persuasive speaker; a persuasive argument. convincing - causing one to believe the truth of something; a convincing story; a convincing manner.