Duba wurin da ke ƙasa sannan ka amsa tambayar daga baya a cikin harshe ɗaya kamar yadda wurin yake:  Passage: Biosphere shine ɓangaren ɓangarorin duniya na waje - ciki har da ƙasa, duwatsu na ƙasa, ruwa, iska da yanayi - wanda rayuwa ke faruwa, kuma wanda tsarin rayuwa ke canzawa ko canzawa. Daga mafi girman ra'ayi na geophysiological, yanayin halittu shine tsarin muhalli na duniya wanda ke haɗa dukkan rayayyun halittu da alaƙar su, gami da hulɗar su da abubuwan da ke cikin lithosphere (duwatsu), hydrosphere (ruwa), da yanayi (iska). Dukan Duniya ta ƙunshi fiye da tan biliyan 75 (fam tiriliyan 150 ko kusan kilo 6.8 × 1013), wanda ke rayuwa a cikin mahalli daban-daban a cikin yanayin halittu. Fiye da kashi tara cikin goma na jimlar halittu a duniya shine rayuwar shuka, wanda rayuwar dabbobi ta dogara da ita sosai don wanzuwarta. Fiye da nau'in shuke-shuke da dabbobi miliyan 2 aka gano har zuwa yau, kuma ƙididdigar ainihin adadin nau'ikan da ke wanzu ya bambanta daga miliyoyin da yawa zuwa fiye da miliyan 50. Adadin nau'ikan rayuwa daban-daban yana canzawa koyaushe, tare da sabbin nau'ikan da ke bayyana wasu kuma sun daina wanzuwa a kan ci gaba. Adadin jinsunan suna raguwa da sauri.  Tambaya: Mene ne ke cikin sararin halitta?
ƙasa, surface duwatsu, ruwa, iska da kuma yanayi