Why isnt anyone talking?

Who was pink floyd? i need answer for assignment answer who he was and three songs he sang.

How does the character of the fourth movement compare with the first three? consider such factors as tempo, texture, rhythmic character, and melodic themes.

Need some ! asap i need to figure out 3 major changes in bridges over time and why these changes to adapt to both improvements in technology and changing social links would also alot.