Canadian Postal Code Database. Get all Canadian Postal Codes and their information in one easy to use database. 2010 Census Database. Get the 2010 Census data in an easy to use format for all summary levels: National, State, COunty, City, and Congressional District. Area Code Database.
Indicator Definition. A chemical indicator is a substance that undergoes a distinct observable change when conditions in its solution change. This could be a color change, precipitate formation, bubble formation, temperature change, or other measurable quality.
CC BY-NC. An indicator species is an organism whose presence, absence or abundance reflects a specific environmental condition. Indicator species can signal a change in the biological condition of a particular ecosystem, and thus may be used as a proxy to diagnose the health of an ecosystem.