The function of pilli on the surface of the bacteria is:

The primary function of pilli are to attach a bacterial cell to specific surfaces or two other cells some bacteria are able to produce conjunction pilli that allow for the transfer of DNA from one bacterial cell to another

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The speed of  sound:   sound travels  at different speeds depending on what it istraveling through. of the three mediums (gas, liquid, and solid)  sound waves travel the slowest through  gases, faster  through  liquids, and fastest  through  solids.