Answer: Your upper and lower arms are connected at your elbow by a hinge joint between your humerus and ulna.
Explanation:
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<span>A Small cell has a large surface area/volume ratio and therefore can exchange molecules with it's external environment rapidly.
So, Here cell with ratio 6:1 is smaller and have ability to better transportation across it's membrane as compared to other cell with ratio 3:1
Hope this helps!</span>
The main part of the nervous system is the C. the brain, which controls all your movements, thinking, and such. After the brain is the B. spinal cord, which helps transmit the messages from the brain to the body parts, as well as vice versa.
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