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Biology 13 Online
crazy101:

The endocrine system contains many glands that secrete

Vocaloid:

surprised nobody has attempted this one https://en.wikipedia.org/wiki/Endocrine_system "The endocrine system is a chemical messenger system consisting of hormones, the group of glands of an organism that secrete those hormones directly into the circulatory system"

BenLindquist:

don't use wiki

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