Answer:
The body's cells use oxygen for metabolism, and this process creates the waste product carbon dioxide. With the help of the lymphatic and circulatory systems, the skeletal system works with the respiratory system by creating red blood cells in the bones that aid in respiration facilitated by the lungs.
Answer:
The farther down a layer with a fossil in it the farther back in earths history that organism lived.
Explanation:
Answer:
A. by breaking off a phosphate molecule from itself structure
Answer:
Fermentation occurs in the absence of oxygen.
