The function of cellular respiration is to reduce $$ \mathrm{CO}_{2} $$ extract usable energy from glucose extract $$ \mathrm{CO}_{2} $$ from the atmosphere synthesize macromolecules from monomers

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The primary function of **cellular respiration** is to **extract usable energy from glucose**. Here's a breakdown of the options:

1. **Reduce $$ \mathrm{CO}_{2} $$**: Cellular respiration actually *produces* carbon dioxide as a byproduct, rather than reducing it.
2. **Extract usable energy from glucose**: **Correct.** Cellular respiration breaks down glucose to produce ATP, which cells use as an energy source.
3. **Extract $$ \mathrm{CO}_{2} $$ from the atmosphere**: Cellular respiration releases $$ \mathrm{CO}_{2} $$ into the atmosphere; it does not extract it.
4. **Synthesize macromolecules from monomers**: This process is part of **anabolic** reactions, such as biosynthesis, not cellular respiration.

**Therefore, the correct answer is:**

**Extract usable energy from glucose**
Cellular respiration extracts usable energy from glucose.

The function of cellular respiration is to reduce \( \mathrm{CO}_{2} \) extract usable energy from glucose extract \( \mathrm{CO}_{2} \) from the atmosphere synthesize macromolecules from monomers

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