Microchips I know for sure and some types of glass
Answer/Explanation:
letters are used as a sign of chemical symbols in today's time
The correct answer is: [C]: " mg " {"milligrams"} .
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For 23., you have to find a way to measure your heart rate not increase it. search it up on google.
It only takes mercury 88 days to go around the sun, and if the man is 50 years old he would be 18,250 days old, so he would've gone around the sun 207.39 times.
