They are two electrons in a neutral atom of helium.
Answer:
Cilia
Explanation:
The element which is responsible for this is the Cilia. The form found in a human's respiratory system are known as Motile Cilia and basically act as brooms on the respiratory epithelium lining the respiratory tract. Huge waves of Motile Cilia communicate with one another in order to be able to effectively clean up all dirt and mucus from the lungs in a very organized and unified manner. This helps maintain our respiratory system running as effectively as possible.
Vascular systems are important to transport materials throughout the organism.
The answer is B. 1,000,000 times
