Medical Mask
Better: N95
Hope this helped.
Crunches
In my educated opinion, crunches would be the best choice out of these options to build strength. A one mile run builds cardio, sit and reach and gymnastics build flexibility and some strength, crunches is strictly abdominal strength.
Confusing but ok
1. Bronchi
2. Trachea
3. Pharynx
4. Alveoli
5. Larynx
The heart would be considered a muscle that works automatically. It is not told to start or stop.
Answer:
C
Explanation:
I think it's C because it happens in the lungs and between the lungs of alveoli and a network tiny blood vessels called capillaries which of the locators in the walls of Alveoli
