Vitamin D is vital ______ bone growth found ______ fish and milk.

For supports bone growth and in identifies sources. This question tests preposition pairs. Other options don’t fit grammatically. For indicates purpose and in denotes containment. Understanding prepositions enhances scientific writing. Correct usage ensures clarity in health discussions. This pair is vital for describing nutrients in professional or academic contexts ensuring accurate depiction in reports or conversations about diet strengthening comprehension of English prepositional usage.