Duba wurin da ke ƙasa sannan ka amsa tambayar daga baya a cikin harshe ɗaya kamar yadda wurin yake:  Passage: Zaɓin halitta yana daidai da rayuwa ta mafi dacewa, amma wannan magana ta samo asali ne a cikin Herbert Spencer's Ka'idodin Biology a 1864, shekaru biyar bayan Charles Darwin ya wallafa ayyukansa na asali. Rayuwa ta mafi dacewa ta bayyana tsarin zabin yanayi ba daidai ba, saboda zabin yanayi ba kawai game da rayuwa ba ne kuma ba koyaushe ne mafi dacewa ya tsira ba.  Tambaya: wane tsari ne yake da ra'ayin da ba daidai ba game da zabin yanayi?
Tsira na mafi dacewa