UNIT AND DIVISION OF LABOR 



149 



3. Show that, if cells represent soldiers, the body is a well- 

 disciplined army, with many divisions for different sorts of 

 work, these divisions made of different regiments, but the 

 regiments of individuals working in harmony. 



e. Common Functions 



Observations. 1. What must a one-celled animal do in order 

 to live? (Review paramoecium.) Note. The necessity for 

 food implies a need of the means for getting it, such as organs 

 of locomotion, nerves, sense organs, etc. After food is obtained 

 it must be digested, then carried about the body (circulation) 

 arid the waste eliminated (excretion), etc. 



Conclusions. 1. Name the organs and functions common 

 to all animals so far as you know them. 



2. How does a one-celled animal compare with a man in the 

 number of its organs, and, therefore, the degree of bodily or 

 physiological division of labor ? 



3. Fill in the following tabulation. Tell means of perform- 

 ing the common functions, as far as possible. 



