Answer: first continuous, then partial
Explanation: Continous reinforcement refers to a reinforcement schedule whereby every correct response performed is praised or reinforced, here, every time John's pet correctly performs that trick, the active or response of the pet is rewarded, thus will help carry out the correct response due to the reinforcement it receives. However, after sometime the reinforcement should be partial such that the action isn't reinforced every time the trick is performed. This according to the partial reinforcement extinction effect is more erobust than continuous reimbursement.
The europeans brought infectuous diseses such as the bubonic plague, chicken pox, pneumonic plague, cholera, diphtheria, influenza, measles, scarlet fever, smallpox, typhus, tuberculosis, and whooping cough. The diseases introduced in the Americas by the Europeans were crowd diseases: that is, individuals who have once contracted the disease and survived become immune to the disease.
Because people or too scared and traumatized to fess up to what had happened to them... It's honestly really sad.
