This is put together perfectly.
Semipermeable means the cell membrane can pick and choose what goes out of it and into it. At least, that's what I believe it is.
The answer is Abduction. In medicine and biomechanics, movements of limbs and other body parts toward or away from the center line of the body are termed as adduction and abduction respectively. Adduction is the movement of a body part toward the body's midline. Abduction is the movement away from the mid line. For example, abduction of the shoulder raises the arms out to the sides of the body.
I think it is from the Paleozoic era
Hope this helps
