Adjective
1. Happening unexpectedly or by chance. (biology-online.org)
2. Refers to the occurrences or existence of all those species that would not be found in a particular region under normal circumstances. (buzzle.com)
Adjective
1. Happening unexpectedly or by chance. (biology-online.org)
2. Refers to the occurrences or existence of all those species that would not be found in a particular region under normal circumstances. (buzzle.com)