A is the answer to this question.
Answer:
Population density
Explanation:
However many people are gather into a single area of space is called population density.
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<span>Cumulus and stratus clouds belong to the low cloud group which exists up to 6,500 feet. Other clouds belonging to this type are s</span>tratus, stratocumulus and
<span>Nimbostratus clouds.Middle clouds include altostratus and altocumulus clouds on the other hand found from 6500 feet to 8000 feet. </span>