Answer:
organ
Explanation:
The level of organization that the heart would be classified as is organ. The heart is an organ that is made of cardiac tissue, and cardiac tissue
Answer:
Eat a balanced diet and get plenty of sleep, because this helps boost energy and increase immunity against disease.
The lungs need to remain elastic so they can<span> effectively move oxygen into the body and carbon dioxide out of the body</span>
Genetics I think I maybe wrong ok
