John is a veteran who suffered traumatic brain damage while in combat. despite having all of his limbs and suffering no other health symptoms, he experiences phantom pain in his extremities. what could be going on with his brain?

He could be suffering with brain damage in his frontal area, it has symptoms of migraine, fluids excreting from his nasal areas and dizziness.

vous êtes les bienvenus, l'amour de la France!

it would lead to upper respiratory infections and pneumonia.

unicellular organisms, like bacteria, are able to perform all life functions within one single cell. multicellular organisms need many different types of cells to carry out the same life processes. each of these special types of cells has a different structure that it perform a specific function.