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Question 4
Magnetism is the force exerted by magnets when they attract or repel each other. Magnetism is caused by the motion of electric charges. Every substance is made up of tiny units called atoms. Each atom has electrons, particles that carry electric charges. Spinning like tops, the electrons circle the nucleus, or core, of an atom. Their movement generates an electric current and causes each electron to act like a microscopic magnet.
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| Post dates | Users | rates | Contents |
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| 2015-11-30 | patel dolly | 80.00 | Check this speaking |
| 2014-03-10 | ioanap | 10.00 | Check this speaking |
| 2015-11-29 | sherko | 80.00 | Check this speaking |
| 2011-06-06 | biohellen | 100.00 | Check this speaking |
| 2015-10-09 | patel dolly | 80.00 | Check this speaking |
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- Using the main point and examples from the lecture, describe Biological clock 80
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