Jawapan

2016-09-23T22:22:08+08:00
X-humerus
Y-ulna
Z-radius (the bone that join with the thumb)

Joint p= Ball-and-socket joint (allow movement in all directions)
sry i meant is the bone y and z
y and z is inversed
owhh...so this is yhe correct answer cuz the bone tht join with thumb is always radius...
ya i did the same too. but too bad the scheme cant be changed.
hahaha...ya