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मित्र जब मंगल का वातावरण खराब होने लगा तो मंगलवासियों ने जमीन के नीचे बस्तियों का निर्माण कार्य आरंभ कर दिया। उन्हें तकनीकी ज्ञान था। अतः इस तरह उन्होंने स्वयं को मंगल के भयंकर वातावरण से बचा लिया। 

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↵which chapter or is it a gk question may i answer in english which chapter or is it a   which chapter or is it a   which chapter or is it a   which chapter or is it a   ↵which chapter or is it a gk question may i answer which chapter or is it a   which chapter or is it a   which chapter or is it a   which chapter or is it a   which chapter or is it a ↵which chapter or is it a gk question may i answer which chapter or is it a   which chapter or is it a   which chapter or is it a   which chapter or is it a   which chapter or is it a ↵which chapter or is it a gk question may i answer which chapter or is it a   which chapter or is it a   which chapter or is it a   which chapter or is it a   which chapter or is it a ↵which chapter or is it a gk question may i answer which chapter or is it a   which chapter or is it a   which chapter or is it a   which chapter or is it a   which chapter or is it a
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Pls ask properly .
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What are you looking for?