Unity and Interdependence in Living World 657 



3. From your studies would you say that unity or disunity predominates in the 

 hving world? Think carefully before answering this question, and give spe- 

 cific reasons why you say so. 



4. What happens when there is more disunity than unity? 



5. Do you think that the phenomenon of interdependence in Nature is deliberate 

 or a mere coincidence? Give reasons why you say so. 



6. Does a study of the interdependence among lower forms of life throw any 

 light upon the problems encountered in human conduct? Explain. 



7. List several ways in which you might improve human conduct with specific 

 suggestions for attaining that goal. 



8. Explain the importance of the nitrogen, oxygen, and carbon cycles in Nature. 



9. Discuss biologic communities (associations) and successions of plants and 

 animals. 



10. Explain the dependence of living animals and plants ultimately upon photo- 

 synthesis, either directly or indirectly. 



11. Explain the causes and effects of animal migrations and plant dispersals. 

 Explain in detail how certain animals have migrated or certain plants have 

 dispersed. Be specific and include examples. 



12. List all the reasons for migrations or dispersals that you can. Do these same 

 reasons apply to human migrations? Explain. 



SELECTED REFERENCES* 



Gamow: The Birth and Death of the Sun, Viking Press, Inc. 



Sanderson: Mystery of Migration, Saturday Evening Post, July 15, 1944. 



^See also additional references in other chapters. 



