Answer: Because each one of them helps other organs, cells, etc.. Because everything in your body needs to work together. For example, one of the most important functions of organ systems is to provide cells with oxygen and nutrients and to remove toxic waste products such as carbon dioxide.
Radius and Ulna.
Those are the long bones that together form the forearm.
The external bone is the radius, and the inside bone is the ulna, they are joint by its extremes.
The humerus is the bone that forms the arm.
Carpus is a conjunction of bones that form the wrist.
Answer:
I think the answer is B. Wave Erosion.
Explanation:
"The waves erode (wear away) the rock at sea level to form sea caves on either side. The waves eventually break right through the headland, creating an arch."
I hope this helps! Correct me if I am wrong.