Answer:
D. Bacteria in improperly prepared food is consumed by humans, causing food poisoning.
Explanation:
Answer:
A class system is a more smooth system, caste is more of a system that changes consistently.
Explanation:
"Class system is typically more fluid than the caste system or the other types of stratification and the boundaries between classes are never clear-cut. Caste system is static whereas the class system is dynamic. ... In the caste system, individual mobility from one caste to another is impossible."
The answer is: "<span>denitrification" .
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