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Science · Grades 3–4

Respiration

noun

The process by which living organisms take in oxygen and release carbon dioxide.

Example Sentences

"Cellular respiration converts glucose into energy."

"Both plants and animals undergo respiration to produce energy."

Synonyms & Related Terms

breathingcellular respiration

Quick Check

Which best describes the meaning of respiration?

Study Tips

To remember respiration, try writing it in a sentence of your own. Connect it to something you already know about science.

Use it in conversation today — saying a word aloud three times helps lock it into long-term memory.