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Target heart rate is generally expressed as a percentage (usually between 50 percent and 85 percent) of your maximum safe heart rate. The maximum rate is based on your age, as subtracted from 220. So for a 50-year-old, maximum heart rate is 220 minus 50, or 170 beats per minute.
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Explanation:
The eye belongs to an organ system called the sensory system. This system includes all the sensory organs of the body, including the ears, eyes,...
Answer:
they are considered empty calories
