keyword

biology 21

Monthly search volume and cost-per-click data for "biology 21" in US.

$ curl "https://api.seodata.dev/v1/keyword?q=biology+21&country=us" +--------------+------------------+ | volume | 90 | | cpc | $0.6 | | competition | 0.54 | | country | US | | updated | 2026-06-22 | +--------------+------------------+

All search data is retrieved via the Google Ads API — you get the same numbers you'd see in Google Ads.

# related keywords

Keywords with overlapping search results, ranked by SERP similarity.

keyword	volume	cpc	overlap
biology crash course	1,300	$15.96	2/20
biology: crash course	1,300	$2.68	2/20
crash course biology	1,300	$8.55	2/20
biol 21	90	$0.26	7/20
bio 21	90	$0.6	3/20
biol 21 sjsu	50	$0	4/20
21st century biology	30	$0	2/20
biology 21st century	20	$0	2/20
biology in the 21st century	20	$0	2/20

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://api.seodata.dev/v1/keyword?q=biology+21&country=us" Returns: volume, cpc, competition Country: &country=us (50+ supported, 2-letter ISO) Auth: none for 20/day, register for 500/month, $4.99/mo unlimited

Full API spec: llms.txt