One example of a very complex land ecosystem full of thousands of kinds of living things

Awind turbine is rotating counterclockwise at 0.5 rev/s and slows to a stop in 10 s. its blades are 20 m in length. (a) what is the angular acceleration of the turbine? (b) what is the centripetal acceleration of the tip of the blades at t=0s? (c) what is the magnitude and direction of the total linear acceleration of the tip of the blades at t=0s?

What sort of waves exhibit the doppler effect?

Which form of cell division creates the sperm and egg, resulting in half of the chromosomes as the other cells?