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<h2>B: the amount of moisture in the Earth’s atmosphere. </h2>
As by definition humidity is the concentration of water vapours in the air. So the best answer is B.
Answer: C. Unilineality
Explanation: Unilineality is a system of determining descendant group in which one belongs to either the male (patriline) or female(matriline) both not both. Both patrilineal and matrilineal system are both examples of a unilineal system.
Ambilineal are non-unilineal where individual can be affiliated to more than one genealogical line.
Cosanguinity refers to being of the same descent with another individual.
The answer is the Columbian Exchange. This refers to a time of social and natural trades between the New and Old Worlds. Trades of plants, creatures, ailments and innovation changed European and Native American lifestyles. Starting after Columbus' disclosure in 1492 the trade kept going during the time of development and revelation.