سؤال قراءة ستيب محلول — فهم التفاصيل (تدريب 6475)
استيعاب المقروء
Vitamin D deficiency can lead to weak bones That’s why the people living in Antarctica suffer from vitamin D deficiency because there isn’t enough sunlight. What does vitamin D deficiency lead to?
Why do countries in the Antarctica have a vitamin D deficiency?
