I'm confused... are you asking if this is the correct answer?
Answer: The topic sentence
Explanation: If the text is properly written, the topic sentence should either be at the beginning of the paragraph/text, or the end, if it is a short text; for things like the heading or title; words in special print; repeated words; things reiterated by pronouns; or ideas being suggested.
Answer:
was.........................
There is no answers. So we cannot help.
Because the sand is lighter and looser than the vegetation and has no cover from the wind so it blows away more easily