Stacey wants to give a speech about how the human heart works. She will be speaking to an audience of about 500 people. Which of the following visual aids would be least effective?
a) a life sized model heart placed on a table in front of the audience
b) a short animated video clip
c) a series of pictures in a Power Point presentation
d) a diagram projected on a screen by the document camera

The answer is A: a life sized model heart placed on a table in front of the audience

Explanation:

i would say b. research typically uses a variety of sources

the arab empire adopted the muslim religion as their main belief. arabs would influence the people from the territories they invaded towards islam (the muslim belief).

nevertheless, throughout the history of the arab empire, rulers brought intellectual individuals from other religions to their centers of learning. these other foreigners included jews, christians, greeks, persians, and indians.   these resulted in the adoption of important knowledge developed by these cultures by the arabic empire. for example, the works of aristotle were translated from greek to arab and indian scientists brought the numerical concept of "zero" to the arabs.

nowadays, 93% of the arab population is muslim, which at the same time is subdivided in sects including the sunni, zaini, alawi, shia. the remaining 7% is composed mainly of christians.