The part of the presentation in which you gain attention, reveal the topic, develop credibility, relation the topic to the audience and preview your main points is called

the branch of biology that deals with the normal functions of living organisms and their parts.

the way in which a living organism or bodily part functions.

the earthquake in haiti was a magnitude of 7.0 according to the u.s geological survey yet the smaller earthquake in haiti killed more than 200,000 and left more than 1.2 million people homeless. the chile earthquake was a magnitude of 8.8 and 500 times more stronger but chile's earthquake only injured 712 people.