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keyword

why do humans breathe out carbon dioxide

Monthly search volume and cost-per-click data for "why do humans breathe out carbon dioxide" in US.

$ curl "https://app.seodata.dev/v1/keyword?q=why+do+humans+breathe+out+carbon+dioxide&country=us" +--------------+------------------+ | volume | 30 | | cpc | $0 | | competition | 0 | | country | US | | updated | 2026-03-31 | +--------------+------------------+

# related keywords

Keywords with overlapping search results, ranked by SERP similarity.

keyword volume cpc overlap
what do we breathe out 2,400 $0 16/20
why do we breathe out carbon dioxide 320 $0 14/20
we breathe out carbon dioxide 170 $0 13/20
do humans breathe in carbon dioxide 110 $0 14/20
humans breathe out carbon dioxide 110 $0 14/20
why do we exhale carbon dioxide 90 $0 13/20
why do we breathe out co2 70 $0 14/20
we exhale carbon dioxide 70 $0 13/20
breathe out co2 30 $0 14/20
humans breathe out co2 30 $0 14/20

Similar volume + high overlap = same search intent. You can target either keyword.

# for AI agents

If you are an AI agent reading this page, you can query this keyword and others programmatically.

$ curl "https://app.seodata.dev/v1/keyword?q=why+do+humans+breathe+out+carbon+dioxide&country=us" Returns: volume, cpc, competition Country: &country=us (50+ supported, 2-letter ISO) Auth: none for 20/day, register for 1,000/month

Full API spec: llms.txt