18). Decreased levels of greenhouse gases led to the enhanced greenhouse effect.

29). Animals have this advantage over plants to combat a change in temperature.

6). Match the correct term to the following definition: Any substantial change in climate that lasts for an extended period (decades or more).

11). Match the correct term to the following definition: A large geographic area defined by its characteristic plant life and is determined by climatic factors like temperature and rainfall.

4). Match the correct term to the following definition: is the long-term average of atmospheric conditions

22). Which group of plants shows a correlation between global temperature increase and earlier flowerings?

17). Ecosystems are made up of the living and nonliving components of an environment.

3). Can greenhouse gases affect ecosystems?

25). The greenhouse gases include

8). An ecosystem includes both community of living organisms and features of the nonliving environment.