Which of the following is a major element of life?

Question

BlackTom AI · Accepted Answer

The question asks to identify a major element of life from the given options.
Option 1: Oxygen (O). This is correct because oxygen is one of the most abundant elements in living organisms, making up a large portion of water and organic molecules, and it is a key component of many biomolecules. In biological contexts, oxygen is considered a major element alongside carbon, hydrogen, and nitrogen.
Option 2: Fluorine (F). Fluorine is not a major constituent of living matter. It occurs only in trace amounts and is not a foundational element in biology.
Option 3: Sodium (Na). Sodium is essential for physiological processes such as nerve transmission and fluid balance, but it is not a major element in the composition of biomolecules or overall biomass.
Option 4: Copper (Cu). Copper is a trace element important for certain enzyme functions, but it is not a major element in living organisms.
Option 5: Potassium (K). Potassium is vital for many cellular processes and is essential, but it is still not classified as a major element in the bulk composition of life when compared to elements like oxygen, carbon, hydrogen, and nitrogen.
In summary, among the choices, oxygen stands out as a major element of life due to its abundance in water and organic compounds, whereas the others are trace or physiologically important elements rather than major constituents.

Which of the following is a major element of life?单项选择题

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