Consider that as part of your audio-video course, you are required to make a short silent film. How would you further your plot in the absence of sound? The easiest method to introduce an important speech by an actor would be to use . You can use to build up the atmosphere and give the audience emotional cues.

placards
intertitles
dialogue boxes

live music
flash cards
auditorium lighting

answer: when the substance contain the two parts (polar and non-polar) like soap.

explanation:

soap is produced from the basic hydrolysis of ester "saponification", it is considered as a salt of hydrocarbons. the soap molecule contains the two parts: a polar group   (-coo-na+) and a non-polar group (r-hydrocarbon part). the polar group is called the head and the tail is the non-polar group. the polar group is hydrophilic in nature (water loving) and the non-polar group is hydrophobic in nature (water repelling).the polar/non-polar nature of a substance is useful that it can dissolve the non-polar substances by the polar part and also can dissolve the polar substances by the non-polar part. it commonly used in detergents and soaps.

Ithink it's a) the user may use the song without the permission of the creator but only in certain circumstances

Because they try steel information eg: bank cards,locations,data they also can look through your webcam