Frequent droughts, combined with human effects on soil, can cause dry and uninhabitable land to expand. this leads to the destruction of fertile land and native wildlife. the process is known as

i would say b. research typically uses a variety of sources

i honestly have no idea

hello,

your answer is ready

i believe its either the first or third option but i'm leaning more towards the third option:

the first excerpt makes a logical appeal, while the second excerpt makes an emotional appeal.

your pal

~papaguy