Naloxone is a partial antagonist of the mu receptor?

Genotype is to phenotype as:

A. feminine is to masculine. B. feminine is to human. C. frequent is to rare. D. hidden is to observable.

Development that occurs in distinct steps or stages, with each stage bringing about behavior that is assumed to be qualitatively different from behavior at earlier stages, is called __________ change

a) discontinuous b) continuous c) critical d) natural