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<p>ranging from breathing difficulties to convulsions and death. Despite this, the <a href="page.php?w=human_body">human body</a> produces small amounts of this sulfide and its mineral salts, and uses it as a <a href="page.php?w=signaling_molecule">signalling molecule</a>.</p>

<p>Hydrogen sulfide is often produced from the <a href="page.php?w=prokaryotic">microbial</a> breakdown of <a href="page.php?w=organic_matter">organic matter</a> in the absence of <a href="page.php?w=oxygen">oxygen</a>, such as in <a href="page.php?w=swamp">swamp</a>s and</p><p>
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