Here are a few better options To have a great amount of diversity is important because it does not only fulfill the state mission and educational equality, but also it teaches us cultural awareness. Having great diversity is important because it does not only fulfill the state mission and educational equality, but it will also teach cultural awareness. Saying "a" 'great diversity' suggests a single diversity. If you are talking about one type of diversity, and you are, name that type: Having a great diversity in the student population is important because it does not only fulfill the state mission and educational equality, but also it will teach students cultural awareness.

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Having great diversity is important because not only does it fulfill the state mission and guidelines of educational equality, but it also teaches us cultural awareness. That sentence sounds like something a council would write, something that not many people would really understand :) I hope my answer was accurate and helpful though.