What are the disadvantages of wind power?

Which age groups shows the graestest diferrence between males and females

Can someone me? i need to have this done as soon as possible! i'm putting 20 points on this!

Which revelation resulted from the observation of the spectrum of different galaxies? a. there were more galaxies whose spectrum was blueshifted b. there were no galaxies whose spectrum was redshifted c. there were more galaxies whose spectrum was redshifted d. there were no galaxies whose spectrum was blueshifted