कोशिका झिल्ली को चयनात्मक पारगम्य झिल्ली क्यों कहते हैं?
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koshika jhilli ko chaynatamak jhilli is liye khte hai kyunki wo cell me aane Jane Wale kuhh hi chizo ka chayan krta hai aur tabhi wo chiz andar jati hai ya bahar aati hai.
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