B i think. hope it helps!
Explanation:
Classification system are system with distribution of classes created according to common relations or affinities.
The winds that move from cold upland areas into lower elevations under the influence of gravity are described as katabatic winds. They are also called downslope winds, or gravity winds.
These winds carry high-density air from a higher elevation (<span>mountains, plateaus, and hills )</span>down a slope under the force of gravity. The katabatic winds<span> occur at night, when the highlands radiate heat and are cooled.</span>
I believe it’s build drainage systems
Answer:
1
Explanation:
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Description
Dark matter is a form of matter thought to account for approximately 85% of the matter in the universe and about a quarter of its total mass–energy density or about 2.241×10−27 kg/m3. .
