Area codes are for phone numbers. Area codes are the first 3 digits of the phone number. Usually represent the area ppl live in. Example: (213) 555-6666 --> area code 213. Zip codes are for mailing addresses.
Ecological succession is the observed process of change in the species structure of an ecological community over time. Within any community some species may become less abundant over some time interval, or they may even vanish from the ecosystem altogether.
Primary ecological succession is the changing sequence of communities starting with the first biological occupation of a place where there were no living organisms previously. For example, the colonization and the following succession of communities on a bare rock is a case of primary ecological succession. Secondary ecological succession is the changing sequence of communities starting with the substitution of a community by a new one in a given place.