What tool used to see the movement of storm clouds

Doppler radar

Explanation:

Doppler radar is an instrument that is widely used for weather forecasting purposes. It helps in determining the speed and direction of the wind motion and cyclones or storms, and other objects such as drops of precipitation. This is usually considered as the Doppler Effect that enables the meteorologists to identify and measure the type of wind and storm motion, whether the movement is horizontal or vertical in the atmosphere, thereby facilitating the weather forecasting methods.

the correct answer is:

a population changes in response to a change in the environment.