The difference between natural and technological system

In a cellular network each cell is controlled by a tower what are these towers called?

Which action is good business etiquette? a. switching your cell phone off before you enter a meeting b. keeping your cell phone on low volume before you enter a meeting c. setting a pleasant ring tone on your cell phone before you enter a meeting d. setting a standard ringtone on your cell phone before you enter a meeting

What type of file does a cookie place on web site visitors' computers so that web site managers can customize their sites to their visitors' preferences?