Fill in the missing words. 7. Breathing is 8. The heart has four 9. Red blood cells carry (waste, oxygen)

Breathing is essential for life as it allows us to take in oxygen, which is necessary for our body's functions and energy production. At the same time, it helps to remove carbon dioxide, a waste product of metabolism, keeping us healthy and balanced. The heart has four chambers: two atria and two ventricles. These chambers work together to pump oxygen-rich blood throughout the body while receiving oxygen-poor blood to be re-oxygenated in the lungs, ensuring that all our organs and tissues receive the oxygen they need to thrive.