EXERCISE 129 



Many of the activities of living things have to do with matters that interfere with life. Conditions 

 vary from one region to another and from season to season ; protoplasm must adjust itself to these 

 variations in space and time. The structures and habits of related animals and plants are accordingly 

 different in different regions, and the appearance and habits of one species vary from season to season. 



Problem. What are some of the differences between the summer and the winter conditions of 

 organisms ? 



What to do. In the following tables indicate briefly what is distinctive during the extreme seasons 

 for five types of plants and for five types of animals. 



PLANTS 



ANIMALS 



[140] 



