Every time Harriet cried, her mother would immediately pick her up. Now Harriet is a real crybaby. Based on what is known about operant conditioning, you should conclude that for Harriet, being picked up acted as:

Positive reinforcement

Explanation:

Positive reinforcement is the reinforcement in operant conditioning. Positive reinforcement is something about adding in stimulus so that the subject repeats the behavior. When the behavior repeated it will strengthen the behavior. The best idea to remember about positive reinforcement to think about adding something. By this process, you can remember or you can identify the positive reinforcement in the real situation. Positive reinforcement occurs quite naturally.

Harriet being picked up is the example of positive reinforcement.  

the united states has a federal government. the president is the head of the federal government of the united states. however, each state forms its government for administration purposes. the powers of the state governments are exercised within restricted state boundaries. and citizens participate in this government by voting.

the correct answer is the following is a list of inventions made in the medieval islamic world, especially during the "islamic golden age" (8th to 13th centuries),[1][2] as well as the late medieval period, especially in the emirate of granada and the ottoman empire.

science and technology in the islamic world adopted and preserved knowledge and technologies from contemporary and earlier civilizations, including persia, india, china, and greece-roman antiquity, while making a number of improvements and innovations.