সকল সরকারী/বেসরকারী পরীক্ষার প্রশ্ন পেতে ক্লিক করুন গণিতের আইকিউ টেস্ট করতে ক্লিক করুন 
The hardness of the bone tissue is due to the phosphates and carbonates of which of the following pairs of elements?
The hardness of the bone tissue is due to the phosphates and carbonates of which of the following pairs of elements?
- ক. calcium and potassium
- খ. calsium and magnesium
- গ. calsium and sodium
- ঘ. magnesium and sodium
সঠিক উত্তরঃ magnesium and sodium
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Basic Information of Daily Science, Inventions and...