The number of electrons in the outer shell determine its reactivity or tendency to form chemical bonds with other atoms.
I think you might've forgotten something. There is no labels, pictures, or any options. Add some more stuff and I'd be able to help out.
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The answer is parable A
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Its the only one that made sense in my eyes some of them didn't even match the topic.
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Gel electrophoresis is a technique used to separate DNA fragments according to their size. DNA samples are loaded into wells indentations at one end of a gel, and an electric current is applied to pull them through the gel. DNA fragments are negatively charged, so they move towards the positive electrode. Really easy
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