Large areas of land are being developed. In the process thousands of trees are being removed and burned. How would this affect the cycle?

The whole cycle is disturbed due to unwise cutting of trees.

Explanation:

Trees are the lungs of the planet earth which helps in cleaning the environment and provide habitat to millions of organisms. Trees absorb carbon-dioxide which is responsible for pollution and global warming and releasing oxygen which is necessary for the survival of living organisms. If these trees are removed, the habitat of many living organism will be destroyed and also increase occurs in the pollution and global warming of the earth atmosphere.

i'm thinking (a) to keep sand in place; ////////////

explanation: a sand fence or sandbreak, like a snow fence, is used to force windblown, drifting sand to accumulate in a desired place. sand fences are employed to control erosion, sand dune stabilization, keep sand off roadways, and to recruit new material in desert areas.