Smoking by students and parents refer to exercise 20. calculate three conditional distributions of students’ smoking behavior: one for each of the three parental smoking categories. describe the relationship between the smoking behaviors of students and their parents in a few sentences.

The development of simple stone tools by early hominids led to the ability to procure meat more efficiently. this in turn led to the change in diet that included larger amounts of protein. many scholars believe that this shift in diet was a significant part of how our ancient ancestors adapted so quickly to a varied set of environments, and thus were able to begin cultural development. this demonstrates the intimate connection between