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I need to know what a nucleus is - The Learning Company Achieve! Math & Science Grades 1-3 (381933) for PC, Mac

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The nucleus is the very dense region consisting of nucleons (protons and neutrons) at the center of an atom. Almost all of the mass in an atom is made up from the protons and neutrons in the nucleus, with a very small contribution from the orbiting electrons.

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Posted on Oct 07, 2009


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Does chromosome gene or nucleus or cell

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