<span>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. For example, plants or lichens sensitive to heavy metals or acids in precipitation may be indicators of air pollution. Indicator species can also reflect a unique set of environmental qualities or characteristics found in a specific place, such as a unique microclimate. </span>
By trading and Conquering
Karakum was created out of sandy river deposits
This usually occurs when masses of air push against each other, but neither one of them if powerful enough too push the other one away! Hopefully that’s right and it helps, not sure if it’s the full explanation tho :)
