Raul has no motivation to read the chapters from his biology textbook that were assigned for homework. According to the Premack principle, Raul could reinforce his textbook reading by doing ___

doing something enjoyable after reading

Explanation:

The Premack principle -

The principle was given in the year 1965 by David Premack .

According to Premack principle ,  

The method to change the activities from time to time , makes the activity less boring and doable .

Hence , from the scenario of the question ,

Raul finds the biology book very boring and unexciting to study , but he does not have any option he need to study the book , so the best approach in order to make the subject interesting by switching things .

He can study for on hour and then go to play or do something interesting for 30 mints , the method will make him study the subject in a better manner .

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.