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1.0: Utangulizi wa Utafiti wa Maisha

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    175380

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    Kutazamwa kutoka angani, Dunia haitoi dalili kuhusu utofauti wa aina za maisha zinazoishi huko. Aina za kwanza za maisha duniani zinafikiriwa kuwa vijiumbe vilivyokuwepo kwa mabilioni ya miaka baharini kabla ya mimea na wanyama kuonekana. Mamalia, ndege, na maua ambayo yanajulikana kwetu wote ni hivi karibuni, wanaotoka miaka milioni 130 hadi 200 iliyopita. Binadamu wamekalia sayari hii kwa miaka milioni 2.5 tu iliyopita, na tu katika miaka 200,000 iliyopita wanadamu wameanza kuangalia kama tunavyofanya leo.

    Picha inaonyesha Dunia kutoka angani.
    Kielelezo\(\PageIndex{1}\): Picha hii NASA ni Composite ya maoni kadhaa satellite makao ya Dunia. Ili kufanya picha nzima ya Dunia, wanasayansi wa NASA wanachanganya uchunguzi wa sehemu tofauti za sayari.