The answer to this is A. Puberty.
The function of the atria is to collect and pump blood into the ventricles. The function of the ventricles is to pump blood into systemic and pulmonary circulations.
People that are spontaneous tend to be more flexible and relaxed and more happier with their lives. their positive lookout on life helps them move towards bigger things.
Some uncontrollable risk factors for disease is genetics and exposure.
Answer: The human circulatory system has a complex network of blood vessels that reach all parts of the body. This extensive network supplies the cells, tissues, and organs with oxygen and nutrients, and removes carbon dioxide and waste compounds.
Explanation: