Do i need to use primary key and unique index if i only have one unique column, mysql

Number of megabytes of ram in a computer. qualitative or quantitative? because

Which of the following tasks is an audio technician most likely to perform while working on a nature documentary? (select all that apply). eliminating potentially distracting background noise adding sound effects making sure the lighting is adequate for a particular scene changing the narration to better match the mood of the documentary

The processing of data in a computer involves the interplay between its various hardware components.