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earth and mars were similar once, what quality of mars made if different to the earth by the present?

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Final answer:

Mars differs from Earth in terms of its size, atmosphere, and geological activity. It had a thick atmosphere and seas of liquid water in the past, conditions associated with the development of life. Currently, Mars has a harsh and inhospitable environment.

Step-by-step explanation:

Mars differs from Earth in terms of its size, atmosphere, and geological activity. Mars is smaller than Earth, with a mass only 0.11 times the mass of Earth. While Mars retains a thin atmosphere and has experienced considerable geological activity in the past, its most significant difference is that it probably had a thick atmosphere and seas of liquid water in the past, which are conditions associated with the development of life. Currently, Mars has a harsh and inhospitable environment, making it different from Earth.

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