ANSWER:
Lesions are areas of damage to motor neurons. Damage to upper motor neurons stops the signals your muscles need to move. When your muscles don't move for a long time, they become weak and stiff. Over time, it can become harder to walk and control your movement.
Explanation:
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MRNA has a complex secondary structure; 3D. While tRNA is more like an X figure.
Answer:
It is made of matter and contains twenty-four molecules.
