Most narcotics are: OA) physically addicting.
O B) depressants to the central nervous system.
O C) pain relievers.
OD) obtained from opium.
O E) all the above

ALL OF THE ABOVE

Explanation:

Convent bonding of cross linking constrain polymer chains from relative movements. the degree of cross linking will correlate with the stiffness of the polymer. highly cross-linked polymers will also have a high resistance to creep as the chains cannot move into new positions.

Explanation: