Which of the following natural processes involve the use and renewal of atmospheric gases? a. condensation of water vapor into precipitation b. decaying of organic matter c. evaporation of surface water by the sun d. all of these

Can someone show me the steps to solve the problem?

Simplify (1/2)4th power a. (1/16) b.(1/8) c.(1/4)

The figure shows triangle def and line segment bc, which is parallel to ef: triangle def has a point b on side de and point c on side df. the line bc is parallel to the line ef. part a: is triangle def similar to triangle dbc? explain using what you know about triangle similarity. part b: which line segment on triangle dbc corresponds to line segment ef? explain your answer. part c: which angle on triangle dbc corresponds to angle f? explain your answer. asap