In the first paragraph,the author most likely mentions the discovery of polar ice caps to suggest that:

Until recently Mars polar ice caps were thought to consist largely of carbon dioxide.

Martian polar ice caps are made almost entirely of water ice

Mars has many similarities to Earth, including the existence of polar ice cps.

Mars has only small fraction of the carbon dioxide found on Earth and Vnus.

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ব্যাখ্যা ও সঠিক সমাধান

উত্তর: Mars has many similarities to Earth, including the existence of polar ice cps.

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