The Primary Difference Between Tropical and Middle-Latitude Forests Is That

Multiple Choice

The primary difference between tropical and middle-latitude forests is that middle-latitude forests have developed a mechanism to counteract: ​

A) long periods of sunlight
B) long periods of high temperatures ​
C) long periods of low humidity ​
D) long periods of low temperatures and annual precipitation variations ​
E) long periods of stormy weather ​