The answers would be wind speed, air pressure, and wind direction.
Wind speed and air pressure are necessary to show how fast the windmill is going, and the wind direction is necessary to show which direction the windmill is going.
Answer:
cell wall,vacoule,and plastids are not present
If he's who I think he is:
A genius! :)
I might be thinking of someone else though!
I think the answer is a sorry if I get it wrong
