18 LIVING THINGS AND THE ENVIRONMENT 



lower growth of shade-loving plants. Animal life abounds, al- 

 though insects and birds predominate in these tropical regions. 



Photo Galloway 



Dense tropical jungle in the Amazon Valley. 



Most of US live in conditions of temperate climate, with its 

 almost complete absence of plant growth in winter but v^ith 

 luxuriance of life in summer. No boy or girl can fail to notice 

 that temperature must play a very important part in determin- 

 ing not only what will grow in a given locality, but also how it 

 will grow. 



