Biology, 21.09.2019 16:20 jbainbynn3198
What is the function of an electromagnet in an electric doorbell? 1) it acts as a switch to open the circuit 2) it acts as a switch to close the circuit. 3) it repels a metal striker, which then pulls away from the bell 4) it attracts a metal striker, which then hits the bell.
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Biology, 21.06.2019 16:30
An atom of nitrogen had seven protons in its nucleus. how many electrons does it have
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Biology, 22.06.2019 15:00
Which of the following must be true for a fossil organism to be useful as an index fossil? a. the fossil organism must be widespread geographically. b. the fossil organism must be abundant. c. the fossil organism must be limited to a short span of geologic time. d. all of the above.
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Biology, 22.06.2019 22:00
When the body has a weakened immune system, the production of antibodies is increased.
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What is the function of an electromagnet in an electric doorbell? 1) it acts as a switch to open th...
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