So for a 50-year-old, maximum heart rate is 220 minus 50, or 170 beats per minute.At a 50 percent exertion level, your target would be 50 percent of that maximum, or 85 beats per minute.

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Sand is made up of silicon dioxide. Glass bottles are made from sand. Fiberglass is made from recycled glass and plastic. Fiberg

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Answer:

1 .The two properties of glass are transparency, and breakage resistance.

2. The two properties of fiberglass that make it suitable for insulating homes is because it eliminates air movement in the space that it occupies, and also it helps the spread of heat.

Explanation:

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Which set of statements best explains the relationship between the parts of the respiratory system? hallhat allow the​

Which set of statements best explains the relationship between the parts of the respiratory system? hallhat allow the