May be carbon
carbon make up the structure of protein
<span>I don't see any options but this is true.</span>
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<span>100 compressions should be performed every minute.</span>
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<span>in order to perform CPR correctly, 100 compressions should be performed every minute, or else it may result in failure to revive.</span>
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<span>Hope this helped</span>
Usually these painting are made on birch trees because the bark has a much smoother surface compared to bark such as an oak tree.
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