Doppler shift - if it’s red shift it’s moving away from you. If it’s blue shift it’s moving towards you.
Answer:
Once tartar has formed, only a dental professional will be able to remove it from your teeth. So, visit your dentist every 6 months to remove any plaque and tartar that might have formed and to prevent further problems.
Explanation:
it is a fusion reaction.................
Explanation:
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The answer is D.
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