A resting heart rate is 60-100bpm for the average adult. Generally, a lower resting heart rate implies more efficient heart function and better fitness. I'm not sure on the second part, sorry.
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.
Ooooo okay cool! Thanks lol
The muscles surrounding the airways contract
Type 1 is correct! hope this helps!
~Zane
