Q: Which one of the following combinations consists of essential components of biomolecules and structural elements of cells?
(a)Carbon, hydrogen, oxygen and nitrogen
(b)Magnesium and phosphorus
(c)Iron, zinc and manganese
(d)Calcium, potassium and sulphur
Correct Answer: (b)
The correct answer is (b): Magnesium and phosphorus. Subject: Geography | Sub-topic: Economic & Mineral Geography Note: This answer was determined through AI-based research. Verify against the official answer key when available.