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 .
Chargement ...
Crée
bonsoir anne marie
merci de votre visite et commentaire
bonne soirée
au revoir
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