The problem of respiratory system
Answer:
Galena
Explanation:
Galena usually occurs in cubic crystals. If you hit a specimen of galena with a hammer it will shatter into small perfect cubic crystals. It has a metallic luster and a black to dark gray color and streak. Galena has a hardness of about 2.5 on the Mohs hardness scale which is about as hard as your fingernail.
Answer:
The official definition for cardiorespiratory endurance is "Cardiorespiratory fitness refers to the ability of the circulatory and respiratory systems to supply oxygen to skeletal muscles during sustained physical activity."
Based on that, the answer is A.
*<u><em>Just for citation purposes, the definition is from Wikipedia.</em></u>
The mean of the population is equal to 55
<span>the population proportion is not less than .65
</span>
