An untreated syphilis infection typically goes through the following three stages: primary, latent, and secondary

Male to female tend to go better than female to male.

a. true b. false

In Pavlov's famous studies, when the presentation of meat was frequently preceded by the sound of a bell, dogs ________.

a. refused to eat the meat b. began to salivate at the sound of the bell c. showed fear responses to the bell d. salivated only when given the meat