Answer the following question: Fact 1: Sand dunes are formed by the wind transporting and depositing sand. Fact 2: Vegetation stabilizes the sand, preventing the wind from forming dunes. Given the two facts above, what will prevent the formation of sand dunes?

Choose your answer from:
1). focusing a lens
2). forces
3). energy barrier
4). flooding
5). erosion
6). less water
7). Solar energy
8). vegetation
Answer:
8).