euphotic
adjective
eu·pho·tic
yü-ˈfō-tik 
: of, relating to, or constituting the upper layers of a body of water into which sufficient light penetrates to permit growth of green plants
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“Euphotic.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/euphotic. Accessed 29 Oct. 2025.
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