Concept:An anemometer is a weather instrument used for measuring wind speed.
Explanation:The diagram shows the typical structure of an anemometer, with cups mounted on rotating arms.
When wind blows, the cups rotate, and the speed of rotation indicates the wind speed.
This helps in studying environmental conditions in a habitat.
It is not a wind vane because a wind vane only shows wind direction.
It is not a hygrometer, which measures humidity or moisture in the air.
It is also not a rain gauge, which is used for measuring rainfall.
Therefore, the instrument represented in the diagram is an anemometer.
Answer:C. Anemometer.
