la vie sur Terre

La vie serait apparue sur Terre il y a 3.5 milliards d’ année environ , au cours des millénaires de minuscules  organismes  très simples  ont évolué pour devenir des etres  vivants très complexe .

C est à dire  l ère primaires qu apparaissent les animaux à carapace  , vértébrés les premières plantes terrestres et les premier amphibiens  et reptiles .

l ére secondaires  voient naitre les mammifères  , les plantes  à fleurs et les premier oiseaux .

Puis à l ére tertiaires , les mammiféres connaissent un développement important qui menera à l apparition de l homme .Cool


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