Wind erosion and deposition may form? a) valleys and alluvial fans
b)beaches and spits
c) sand dunes and loess deposits
d) valley glaciers

C. sand dunes and loess deposits

Explanation:

Wind erosion is when wind forcefully moves sand particles from one place to another. This can end up forming sand dunes which comes in different shapes.

Also, loess are gotten from silt and clay that are blower by wind and deposited on a large area lawyer of land. Therefore, wind erosion and deposition may form dunes and loess deposits.

this is math not biology xd

when it is at an intermediate population density