24 ENVIRONMENT OF PLANTS AND ANIMALS 



Home Work. — Determine the factors of the environment of 

 a plant ; of some wild animal ; of a cat or a dog (domesticated 

 animals) ; of yourself. Bring to class a written statement of 

 your answers. 



Having compared these different living things in their differ- 

 ent environments, decide what factors are common to all envi- 

 ronments. 



Conclusion. — 1. What are the factors in the environment 

 of living things ? 



2. Tabulate the factors as suggested below : 



Problem 2 : Comparison of a natural with an artificial en- 

 vironment. 



Method and Observations. — Determine what is added to or 

 subtracted from your home environment to make it different from 

 the natural environment of the country. Make two columns. 

 In the first, place the factors of a natural environment. In the 

 second, place the factors of the environment in a city or town. 



Remember that the city has various agencies which add to the 

 air certain substances ; that housing conditions are changed ; 

 that the earth is covered by pavement ; and that water supplies 

 and disposal of waste through sewers are artificial factors. Think, 

 too, of many other ways in which the city environment is changed. 



