5. Morphine functions as an:
A. endorphin agonist.
B. endorphin antagonist.
C. dopamine agonist.
D. dopamine antagonist.

A. describe the model of urban structure most often observed in mega-cities in developing countries. explain how this model differs from common urban structures in north america. b. describe at least two factors leading to the growth of mega-cities in developing or least-developed countries. c. identify and explain two factors that led to the formation of squatter settlements in mega-cities in developing countries.

Which of the following types of stars had the smallest initial mass? which of the following types of stars had the smallest initial mass?

Along with removing drugs from the body, the kidneys also a. balance ph levels b. release hormones that regulate blood pressure c. release hormones into the stomach d. a and b