Answer: Exhaled air consists of 78 percent nitrogen, 16 percent oxygen, 4 percent carbon dioxide and potentially thousands of other compounds.
Explanation: Does this help???
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<em>Link: https://www.colgate.com/en-us/oral-health/conditions/gum-disease/bleeding-gums-and-other-warning-signs-of-gingivitis-0513?gclid=CjwKCAjwza_mBRBTEiwASDWVvo_et869pPrZ0jvugs8GD6j_fJPu_siate7cRUMEDaA8LGRPKvyIIBoClj0QAvD_BwE&gclsrc=aw.ds&</em>
Answer:
The answer is A: first class lever
Cardiovascular System
In addition, the blood vessels that direct blood to the large muscles and the heart dilate, thereby increasing the amount of blood pumped to these parts of the body and elevating blood pressure. ... This long-term ongoing stress can increase the risk for hypertension, heart attack or stroke.
