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> link to source and animation
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source Covalent bonds form when electrons are shared between atoms and are attracted by the nuclei of both atoms. In pure covalent bonds, the electrons are shared equally. In polar covalent bonds, the electrons are shared unequally, as on
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> link to *iron* webpage
> link to *water* webpage
→ link to full article excerpt: ‍ ‍ Life arose on our planet in a reducing environment. The first kind of photosynthesis probably did not involve the evolution of molecular oxygen, but this complicated process evolved at least 3 billi
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> link to *oxygen* webpage
> link to website
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> link to video
> link to full article Redox reactions are intrinsically linked to energy metabolism. Therefore, redox processes are indispensable for organismal physiology and life itself. The term reactive oxygen species (ROS) describes a set of di
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