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<h3><span class="mw-headline">Gene theory</span></h3>
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<div class="thumbinner" style="WIDTHwidth: 182px;"><img classwidth="thumbimage180" height="260" class="thumbimage" alt="Schematic representation of DNA, the primary genetic material." width="180" longdesc="/wiki/Image:DNA-structure-and-bases.png" src="http://upload.wikimedia.org/wikipedia/commons/thumb/b/b8/DNA-structure-and-bases.png/180px-DNA-structure-and-bases.png" />
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Schematic representation of DNA, the primary genetic material.</div>
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<p>While organisms may vary immensely in appearance, habitat, and behaviour it is a central principle of biology that all life shares certain universal fundamentals. A key feature is reproduction or replication. The According to <a href="javascript:void(0);/*1256199523180*/">paper writing</a>, the entity being replicated, the replicator, in the past was considered to be the organism during the time of Darwin, but since the 1970s increasingly reduced to the scale of molecules.<sup class="reference" id="_ref-1">[2]</sup> All known life has a carbon-based biochemistry, carbon is the fundamental building block of the molecules that make up all known living things. Similarly water is the basic solvent for all known living organisms. While all these things are true of all organisms observed on Earth, in theory alternative forms of life could exist and some scientists do look at alternative biochemistry.</p>
<p>All terrestrial organisms use DNA and RNA-based genetic mechanisms to hold genetic information. Another universal principle is that all observed organisms with the exception of viruses are made of cells. Similarly, all organisms share common developmental processes.</p>
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<h3><span class="mw-headline">Homeostasis</span></h3>
<p>[[Homeostasis]] is the ability of an open system to regulate its internal environment to maintain a stable condition by means of multiple dynamic equilibrium adjustments controlled by interrelated regulation mechanisms. All living organisms, whether unicellular or multicellular, exhibit homeostasis. Homeostasis manifests itself at the cellular level through the maintenance of a stable internal acidity (pH); at the organismic level, warm-blooded animals maintain a constant internal body temperature; and at the level of the ecosystem, as when atmospheric carbon dioxide levels rise and plants are theoretically able to grow healthier and remove more of the gas from the atmosphere. Tissues and organs can also maintain homeostasis.</p>
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<ul>
<li>[http://biosites.org Biosites.org]</li>
<li>[http://biologywiki.org Biologywiki.org] </li>
<li><a title="PhyloCode" href="http://en.wikipedia.org/wiki/PhyloCode">PhyloCode</a>, <a class="external free" title="http://www.ohiou.edu/phylocode/index.html" rel="nofollow" href="http://www.ohiou.edu/phylocode/index.html">http://www.ohiou.edu/phylocode/index.html</a> </li>