When evaluating your compare-and-contrast paragraph, it is essential to ensure that a. your paragraph is lengthy enough.
b. you answered the prompt logically.
c. you included your own opinion of the topic.
d. your conclusion introduces new points.

b. you answered the prompt logically.

Explanation:

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option c (nickel) is not found in earth's crust. the earth's crust basically contains eight (8) elements namely: oxygen, silicon, aluminum, iron, calcium, sodium, potassium and magnesium (listed in order of abundance).