2.Question 2Which of the following statements about methane on Mars is not true?1 pointThe abundance of methane initially reported could be caused by well understood geochemistry without the need for biological agentsDetection of methane on Mars from the Earth is made more difficult by the presence of methane in Earth's atmosphere.The expected methane lifetime on Mars is decades, so it is difficult to explain the variability observed.The abundance of methane initially reported could be caused by a few isolated areas containing methanogenic microbes.The amount of methane measured by Curiosity in the "enhanced" measurements is equivalent to that emitted in the burps of about 100 cows.The Mars Curiosity detections of methane show that the previous reports of methane on Mars were correct.3.Question 3

Methane is ______ times more active GHG gas compared to carbon dioxide.   15 17 19 21

4.Question 4Which of the following statements is not true?1 pointIf microbes are to hitchhike from Earth to Mars, the rock in which they are embedded needs to not have been molten by the initial impact.If microbes hitchhiked to Mars from Earth and found a habitable environment, the terrestrial microbes would most likely have had to have been archea.Microbes would have been more likely to have survived the trip from Earth to Mars if they were in space for only a few years.Microbes capable of surviving years in space have been found.To survive unmelted, the rocks with embedded microbes would need to fall on a planet with a very small atmosphereMeteorites have been found on the Earth that have come from Mars and that have stayed at temperatures low enough for microbe survivalMicrobes could have traveled from Mars to Earth and started life on Earth

The most abundant gas in Mars isGroup of answer choicesNitrogenOxygenCarbon dioxideHydrogen

Methane is ______ times more active GHG gas compared to carbon dioxide.

Which of the following does not contribute to elevating Methane levels?