20 LABORATORY STUDIES UPON TYPIC ANIMALS 



3. Struggle for existence. Give reasons for the threefold 

 struggle for existence among animals. 



4. Digestion. What advancement or degeneration is there 

 in the organs of digestion of this animal compared with those 

 of the last animal studied? 



5. Circulation. What advancement or degeneration in the 

 circulatory organs as compared with those of the last animal 

 studied? 



6. Respiration. W^hat advancement or degeneration, if 

 any, in the organs of respiration of this animal as compared 

 with those of the last animal studied? 



Any difference in the respiratory organs of the young from 

 those of the adult animal? 



7. Nervous System. What advancement or degeneration 

 in the nervous system of this animal, as compared with that 

 of the last animal studied? 



8. What organ, if any, appears here for the first time in the 

 animal kingdom? 



9. Any metamorphosis? If so, name the animal in each 

 stage of its development. 



10. Home. 



(1) Its home is called nest, den, or what? 



(2) Location of home? 



(3) Materials used? 



(4) Tools used in making the home? How is the home 



made? 



(5) Purpose of the home? 



11. Food. 



(1) Food of the young? 



(2) Food of the adult? 



(3) Food in summer? Does it vary from that of winter? 



How? 



(4) How does this animal obtain its food? 



(5) Where does it obtain it? 



(6) When does it obtain it? 



(7) Does this animal injure man's crops? If so, how? 



Remedy? 



(8) Is it in any way beneficial to man's crops? How? 



