Reproductive isolation is essential for the process of speciation and much has been learned in recent years about the ecology and underlying genetics of reproductive barriers. But plant species are ...

Suggested Citation: "1 Introduction." National Academies of Sciences, Engineering, and Medicine. 2020. Social Isolation and Loneliness in Older Adults: Opportunities for the Health Care System.

Visit NAP.edu/10766 to get more information about this book, to buy it in print, or to download it as a free PDF. 4 The survey did not inquire about what kind of loneliness participants felt and ...