Why darwin's theory is not the theory of evolution

Why do we perceive objects as retaining their brightness under different lighting levels?

Other than earth, is also known to have magnetic pole reversal? a: venus b: mars c: earths moon d: the sun

Which of these is an example of land degradation? a. containers designed to store pollutants leak. b. fertilizers provide too many nutrients to crops. c. garbage is buried so the land can be reclaimed later. d. a drought kills all the plants in an area, leaving bare land