Related Experiment Video
Updated: Jun 13, 2026

07:57
Necropsy-based Wild Fish Health Assessment
Published on: September 11, 2018
Fish intake and mercury levels: only part of the picture
The Journal of Pediatrics
|April 20, 2010
Abstract
No abstract available in PubMed .
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The Periodic Table and Organismal Elements
Elements are the smallest units of matter that cannot be broken down further by chemical processes. There are 118 known elements, but not all of these are naturally occurring, and only a few of them are essential for life. Living matter is composed primarily of carbon, nitrogen, hydrogen, and oxygen, with smaller amounts of other elements like calcium, phosphorus, potassium, and sulfur. Other elements are also necessary for life but only in trace amounts.
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When cells are placed in a hypotonic (low-salt) fluid, they can swell and burst. Meanwhile, cells in a hypertonic solution—with a higher salt concentration—can shrivel and die. How do fish cells avoid these gruesome fates in hypotonic freshwater or hypertonic seawater environments?