B
the vegetation acts as a barrier blocking the sands movement.
in time,the wind blows more on top of it and it continues this process,forming a dune.
much like how snow drifts are formed next to houses.
The answer would be A, a system because all the others are just again parts of a system.
Among the given name of the equinoxes, the fall equinox and the spring equinox are the valid names for the equinoxes.
The fall equinox, or the autumn equinox is the September equinox, while the spring equinox, which is also known as the vernal equinox is the March equinox.
There are no such equinoxes as partial or total equinox.
Hence, the correct answer is option A and D.
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