Electron microscopes differ from light microscopes in that they produce an image of a specimen by using a beam of electrons rather than a beam of light. Electrons have much a shorter wavelength than visible light, and this allows electron microscopes to produce higher-resolution images than standard light microscopes
Hello!
Your answer is A.. Earth's core is the most dense layer and it consists of the outer core and the inner core.
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DNA
sorry if it’s wrong, but that answer seems reasonable