Oxygen in Earth's Atmosphere Is Derived from ________

question 18

Multiple Choice

Oxygen in Earth's atmosphere is derived from ________.

• A)volcanic outgassing
• B)photosynthesis
• C)animal respiration
• D)water from the oceans breaking down into hydrogen and oxygen during evaporation

---

Definitions:

Benzoic Acid

A simple aromatic carboxylic acid with the formula C6H5COOH, used widely as a food preservative.

Methylamine

A simple organic compound consisting of a methyl group linked to an amine group, commonly used in organic synthesis.

Compound

A substance formed by the chemical combination of two or more elements in definite proportions and structure.

Aniline

An organic compound, specifically an amine derived from benzene, widely used in dyes and polymers.