3. Origines de la vie : le contexte

Clip de la 1ère semaine du MOOC UVED "Biodiversité" Dans une première semaine de cours, découvrez ce qu'est la biodiversité, ses origines il y a plus de 3,8 milliards d'années, et les

In this first part, discover what are the biodiversity, its origins 3,8 billion years ago, and its evolution mechanisms, especially the extinction crisis of the main species. You will better

Bruno David comes back to the main biodiversity crisis. He focuses on 2 aspects : the crisis recording and the exit from the crisis. Firstly, he explains that, contrary to what can be supposed, there

Bruno David revient sur les grandes crises d'extinction de la biodiversité. Il se focalise sur deux aspects : d'une part l'enregistrement de ces crises en montrant que contrairement à ce que l'on peut

Bruno David revient sur les grandes crises d'extinction de la biodiversité. Il en fait l'inventaire depuis plusieurs centaines de millions d'années et il discute des facteurs qui peuvent en être à l

Marie-Christine Maurel comes back to the formation of the first living cells on the earth surface, relying on several great experiments. The she presents the extent of questionings which still remain,

Marie-Christine Maurel explores the origins of life on earth. She highlights the main conditions 3 billion years ago, as well as the emergence of the first forms of life, which gave birth to the tree

Marie-Christine Maurel revient sur la formation des premières cellules vivantes à la surface de la terre. Elle s'appuie sur plusieurs grandes expériences qui, depuis un siècle, permettent de

Bruno David comes back to the main biodiversity crisis. He takes an inventory of the crisis for hundreds of million years and he discusses their potential factors of origin : oxygenation of the marine

In relation to the erosion of biodiversity, Gilles Boeuf presents arguments in favor of the upholding of this biodiversity: human health, technology innovation, bio-inspiration, or economy.

Gilles Boeuf reports the erosion of biodiversity and presents the four main factors which can be associated to this dynamics: destruction and pollution, resources overexploitation, species

Gilles Boeuf comes back to the main stages of the history of life. He begins with the oceans, where life appeared over 3,5 billion years ago, mentions the lands conquest, and ends with the appearance