spine – n. backbone; the connected bones down the middle of the back

parasitic – n. of or related to an organism living in, with or on another organism

twin – n. one of two persons produced at a birth

three-dimensional – adj. having or appearing to have length, width and depth

numbness – n. the not able to move

paralysis – n. a condition in which you are unable to move or feel all or part of your body

approach – v. to move or become nearer to something or someone

junction – n. a place where two things join

foster family – n. a family that cares for a child for a short time

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