Answer:
Explanation:
Animals obtain carbon by eating and gaining nutrients. This gives them carbon. They get hydrogen by water and glucose. They get nitrogen from food.
The oldest fossils would be at the bottom, while the youngest would be closer to the surface.
Answer
Elastin fibers are glycoproteins found in the lungs and are usually in large quantities. The abundant elastin fibers are helpful in the recoil process of the lungs after being expanded by the muscles of the respiratory system.
During inhalation,the diaphragm and intercostal muscles expand the chest. This forms a negative pressure and draws the air in.The Lungs recoil to expel used up air during exhalation.
