PLANTS AND THEIR SURROUNDINGS 269 



QUESTIONS 



1. What is evolution? 



2. What is the difference between heredity and environment? 



3. Why do some plants grow in dry places and others in moist 



places ? 



4. Where are the greatest forests? 



5. Why do vines climb up trees? 



6. Why do we see certain forest flowers growing in the spring but 



not in the summer? 



