Question

which element is most abundant in living organisms?
○ gold
○ carbon
○ sodium
○ iron

Explanation:

To determine the most abundant element in living organisms, we analyze each option:

• Gold: Not abundant in living organisms; it has no major biological role.
• Carbon: Fundamental to life as it forms the backbone of organic molecules (carbohydrates, proteins, lipids, nucleic acids), making it highly abundant.
• Sodium: Important for physiological processes but not the most abundant.
• Iron: Essential for functions like oxygen transport but present in lower amounts compared to carbon.

Answer:

B. Carbon