There are also some special post codes: the airport has its own post code (1300), the UN (1400) and some big companies also have their own post code, for example the ORF, the Austrian National Broadcasting Service (1136).
Two different types of succession, primary and secondary, have been distinguished. Primary succession occurs in essentially lifeless areasâregions in which the soil is incapable of sustaining life as a result of such factors as lava flows, newly formed sand dunes, or rocks left from a retreating glacier. Secondary succession occurs in areas where a community that previously existed has...
 Primary succession begins in areas where no soil is present.   Secondary succession occurs in areas where there is soil  already present.      Ecological su â¦ ccession refers to orderly changes in an ecological  community.econdary succession occurs on previously occupied land such as an area that has been devastated by a forest fire. Soil with organic content is found on this piece of land and organisms may be present at the beginning.