In the practice of science, how is the accuracy of a scientific claim evaluated?
by carefully gathering and analyzing a variety of opinions from the public
by testing the claim's predictions in a controlled setting
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by critically considering alternative scientific claims or explanations
by repeating the experiments that led to the claim being made
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The higher you go up the less oxygen there is 

There are many you can go on and ask boring questions about being bored when you’re bored : )

Mars and earth have quite a few things in common. both are  terrestrial planets, both are located within the sun’s  habitable zone, both have  polar ice caps, similarly  tilted axes, and similar  variations in temperature. and according to some of the latest scientific data obtained by rovers and atmospheric probes, it is now known that mars once had a  dense atmosphere  and was covered with  warm, flowing water.