Why is it commonly believed that carbon dioxide is responsible for global warming? 1.Carbon dioxide levels in the Earth’s atmosphere have been steadily decreasing.

2.Carbon dioxide has a longer average lifetime in the atmosphere.

3.The warming effect associated with carbon dioxide has remained unchanged.

4.Other greenhouse gases amplify the effect of carbon dioxide.

Sarah and john are having a discussion on genetic diversity. sarah believes that it happen over a long period of time. john it happens immediately. who is correct? a. sarah is correct because genetic diversity occurs over a long period of time. b. john is correct because genetic diversity occurs immediately. c. both are correct because genetic variation can occur or long period of time. d. neither are correct because genetic diversity occurs over any period of time

Si units are the modern form of the

You have trained year for a marathon. in your first attempt to run a marathon, you decide that you want to complete this 26-mile race in 4-5 hours. a. what is the length of a marathon in kilometers (1mile= 1.6 kilometers). b. what would your average speed have to be to complete the race 4.5 hours? give your answer in kilometers per hour.