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???
The heart is strengthend through cardiovascular exercise.
Answer:
True.
Explanation:
The amount of protein that everybody needs is different for everyone and it is determined by the age, the size, how are his or her metabolic rate and the lifestyle that the person has. Not only the amount of protein is determined by those factors the number of fats and carbohydrates too.
