If u mean the endocrine system .The endocrine system is the collection of glands of an organism that secrete hormones directly into the circulatory system to be carried towards distant target organs.
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If it's too cold, or too hot (-40 and 400d) We wouldn't be here. The sun is in the perfect place, so we don't freeze, or burn.
If revealing your piercings during travel is unacceptable, wear nonmetallic jewelry. Quality metal body jewelry is non-ferromagnetic and will not set off the large walk-through metal detectors. ... You can still wear your metal piercing jewelry when you travel, and the TSA will not ask you to remove them.
