306 FIRST YEAR COURSE IN GENERAL SCIENCE 



359. The Processes of Animal Nutrition. Thus it is 

 seen that in animals and in plants nutrition consists of the 

 same essential stages: 



The taking in of food and oxygen. 



The digestion of food. 



The transforming of food into live tissues. 



The oxidation of that tissue to yield energy. 



The excretion of the waste products resulting from 

 oxidation. 



The elimination of the indigestible residue left from 

 digestion. 



EXERCISES 



1. What is the importance of reproduction? 



2. Why is it not necessary that a bird should lay as many eggs as 

 a fish, in order to continue the race? 



3. What similar provision is made by plants and animals for the 

 early development of their offspring? 



4. What relation has the amount of nourishment in an egg to the 

 size of the animal that hatches from it? Illustrate. 



6. Does the care of a few young, or the production of a large num- 

 ber of offspring that receive no care, give better results to the race? 

 Give instances that illustrate your answer. 



6. (a) Suggest a reason why grass cannot serve as food for a dog. 

 (b) Why cannot a horse subsist on meat? 



7. Why does the loss of much blood cause death? 



8. (a) Account for the different amounts of food required by cold- 

 blooded and by warm-blooded animals. (6) What is the value of the 

 hair or the feathers covering the bodies of most warm-blooded animals? 



9. To what organisms are the excreted waste products of animals 

 useful, and for what purpose? 



10. What waste product of plants do animals require? 



11. Explain how some hibernating animals are able to live without 

 food for a long time. 



12. Through what organs do animals excrete carbon dioxide? 



