1.

What are indicators ?????

Answer»

A thing that indicates the state or level of something.
a device PROVIDING specific information on the state or condition of something, in particular:
a flashing light or (formerly) other device on a vehicle to show that it is about to CHANGE lanes or turn.
a compound which changes colour at a specific PH value or in the presence of a particular substance, and can be used to monitor acidity, alkalinity, or the progress of a reaction.
an animal or plant species which can be used to infer CONDITIONS in a particular habitat.



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