Question

which of the following is a primary greenhouse gas? a. nitrogen b. oxygen c. carbon dioxide d. helium what is the main cause of the enhanced greenhouse effect? a. the natural greenhouse effect b. increased greenhouse gas emissions from human activities c. natural volcanic activity d. changes in earths orbit what does climate represent? a. daily temperature variations b. long - term patterns of weather c. the temperature on a specific day d. immediate weather conditions

Explanation:

• For the first question, carbon - dioxide is a well - known primary greenhouse gas. Nitrogen, oxygen, and helium do not have significant greenhouse - gas properties.
• For the second question, the enhanced greenhouse effect is mainly caused by increased greenhouse gas emissions from human activities like burning fossil fuels. Natural factors play a much smaller role compared to human - induced emissions.
• For the third question, climate represents long - term patterns of weather, while daily temperature variations, temperature on a specific day, and immediate weather conditions are related to weather, not climate.

Answer:

1. c. Carbon dioxide
2. b. Increased greenhouse gas emissions from human activities
3. b. Long - term patterns of weather